Theoretical and Applied Fracture Mechanics最新文献

{"title":"Effect of testing temperatures on the toughness properties of Q355 steel welded at ambient and low temperatures","authors":"Tong Sun ,&nbsp;Jianlei Zou ,&nbsp;Yuanqing Wang ,&nbsp;Yongjiu Shi","doi":"10.1016/j.tafmec.2026.105457","DOIUrl":"10.1016/j.tafmec.2026.105457","url":null,"abstract":"<div><div>This study systematically investigates the coupled influence of welding environmental temperature and testing temperature on the fracture behavior and ductile-to-brittle transition characteristics of Q355 steel welded joints. Charpy impact and fracture toughness tests were performed on the weld metal (WM) and heat-affected zone (HAZ) over a testing temperature range from 23 °C to −100 °C under two welding conditions: room-temperature welding (23 °C) and low-temperature welding (−10 °C). The transition behavior was evaluated using the Master Curve methodology and Boltzmann fitting from both impact- and fracture-mechanics-based perspectives. The results demonstrate that low-temperature welding significantly enhances low-temperature fracture toughness and reduces data scatter in both WM and HAZ. Both the reference temperature <em>T</em>₀ and the ductile-to-brittle transition temperature <em>T</em>_t are shifted to lower values under low-temperature welding, reflecting reduced embrittlement sensitivity. While the WM consistently exhibits higher fracture toughness than the HAZ, the HAZ remains more sensitive to low temperatures. Moreover, discrepancies between impact-based and fracture-mechanics-based transition temperatures are minor in the WM but pronounced in the HAZ, highlighting the different sensitivities of the two methods to fracture mechanisms. These findings provide mechanistic insight into low-temperature embrittlement of welded joints and offer practical guidance for optimizing welding procedures and fracture safety assessment of Q355 steel structures operating in cold environments.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105457"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing for toughness: How substrate stiffness controls crack path and effective engagement of toughening layers in adhesively bonded CFRP joints","authors":"R. A.A. Lima ,&nbsp;S. Teixeira de Freitas","doi":"10.1016/j.tafmec.2026.105473","DOIUrl":"10.1016/j.tafmec.2026.105473","url":null,"abstract":"<div><div>Tailoring the stacking sequence of composites bonded joints improves fracture toughness and damage tolerance of the joint by encouraging extrinsic toughening mechanisms, such as crack deflection and crack branching. Previous works show that in composite substrates with tailored laminates, each crack deflection into a new ply can increase the joint's toughness. Still, once a 0° layer is reached, toughness drops abruptly due to sudden delamination. To overcome this limitation, this work explores embedding a co-cured film-adhesive layer to prevent delamination in 0° plies. It examines how the substrate's bending stiffness influences the effectiveness of this toughening strategy. Quasi-static double cantilever beam tests on four different carbon fibre reinforced laminates, with and without the co-cured layer, revealed two regimes: (i) compliant substrates lead to high peel stresses, triggered crack deflection into ±45° plies, enabling bridging and rising R-curves—up to 200% toughness increase; (ii) stiffer substrates suppressed near-tip rotation, and promoted cleavage-like crack growth with minimal toughening.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105473"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A multi-patch isogeometric phase field approach for ductile fracture","authors":"Zhanfei Si ,&nbsp;Hirshikesh ,&nbsp;Lin Wang ,&nbsp;Sundararajan Natarajan ,&nbsp;Tiantang Yu","doi":"10.1016/j.tafmec.2026.105496","DOIUrl":"10.1016/j.tafmec.2026.105496","url":null,"abstract":"<div><div>This study presents a phase field model for simulating ductile crack growth under small-strain conditions. In this work, the key contribution lies in the introduction of an exponential toughness degradation function that relates fracture toughness to the accumulated plastic strain, while the crack-driving force remains governed by the elastic energy. Unlike many existing ductile phase-field formulations, this approach preserves the linearity of the AT2 phase-field subproblem, thereby simplifying numerical implementation. An isogeometric analysis framework is adopted for describing the unknown fields and the geometries. To accommodate complex geometries, the computational domain is constructed using a multi-patch modeling strategy. Continuity of both displacement and phase-field variables across the patch interfaces is weakly enforced through Nitsche’s method. Locally refined non-uniform rational B-splines (LR NURBS) are employed to maintain an exact geometric representation and enable targeted refinement near damage zones, effectively reducing the number of active degrees of freedom and computational cost. The accuracy and efficiency of the proposed multi-patch isogeometric analysis-based ductile phase-field framework are compared against the numerical and experimental results reported in the literature.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105496"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fracture characteristics and energy catastrophe properties of sandstone with the circular hole: The influence of different inclusions","authors":"Kai Zhang ,&nbsp;Guowei Ma ,&nbsp;Ke Zhang","doi":"10.1016/j.tafmec.2025.105430","DOIUrl":"10.1016/j.tafmec.2025.105430","url":null,"abstract":"<div><div>Holes, as the common defects in rock masses, are often accompanied by natural or artificial inclusions, which further complicate the failure mechanisms. To study the fracture mechanisms of sandstone with the circular hole under various filling conditions, uniaxial compression tests are conducted on three types of specimens. Combined with digital image correlation (DIC) and energy evolution theory, the mechanical degradation, crack propagation, spatial and temporal non-uniformity of deformation, and energy catastrophe characteristics are analyzed. The results show that the presence of the hole significantly degrades the mechanical properties of sandstone, with the uniaxial compressive strength (UCS) and elastic modulus (<em>E</em>) reduced by approximately 34.08 % and 21.03 %, respectively, compared with intact specimens. Inclusion filling partially restores the mechanical performance: soft inclusion increases the UCS and <em>E</em> by about 8.50 % and 14.17 %, whereas hard inclusion leads to more pronounced improvements of approximately 12.48 % and 19.87 %, respectively. The crack evolution patterns vary considerably with the filling condition: unfilled specimen experience tensile crack initiation followed by tensile-shear transition leading to shear-dominated failure; soft inclusions delay crack propagation and promote interface-controlled ductile failure; hard inclusions accumulate internal cracks, resulting in more abrupt and brittle instability. The proposed spatial and temporal non-uniformity indicators (<em>I</em>_<em>S</em> and <em>I</em>_<em>T</em>), derived from DIC data, effectively characterize the evolution of strain localization and identify the transition from stable fracture to unstable fracture. Moreover, the developed grey cusp catastrophe model based on elastic and dissipated strain energy density evolutions successfully captures abrupt changes in energy evolution, providing reliable physical interpretation and validation for the instability trends revealed by <em>I</em>_<em>S</em> and <em>I</em>_<em>T</em>.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105430"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145886124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the mechanical anisotropy and crack propagation in composite rock masses containing weak interlayers and double fissures","authors":"Mingchao Wan ,&nbsp;Nan Yao ,&nbsp;Binyu Luo ,&nbsp;Zheng Wan ,&nbsp;Yicheng Ye","doi":"10.1016/j.tafmec.2026.105471","DOIUrl":"10.1016/j.tafmec.2026.105471","url":null,"abstract":"<div><div>Layered rock masses, as complex geological media, exhibit mechanical behaviors predominantly controlled by internal weak interlayers and inherent fissures. This study aims to reveal the anisotropic characteristics of the mechanical behavior of layered rock masses under the interaction between weak interlayers and fissures. Uniaxial compression tests were conducted on rock-like specimens containing weak interlayers and prefabricated double fissures, combined with Digital Image Correlation (DIC) and Acoustic Emission (AE) monitoring techniques, to analyze the damage evolution process and the mechanical mechanisms of crack propagation. The results indicate that: (1) The initiation and propagation of tensile wing cracks at the fracture tips exhibit a strong competitive advantage, which weakens as the bedding dip angle increases. (2) The rock bridge serves as a key area for stress concentration and is influenced by the bridging angle <em>β</em>, governing the type of dominant cracks and the pattern of coalescence. (3) The weak interlayer significantly alters the interlayer stress field, inducing cracks to initiate vertically to the interlayer interface or to deflect, while demonstrating typical “barrier” and “guiding” dip effects on tip cracks. (4) The failure mode of the rock mass is primarily characterized by composite failure involving tensile cracking at the tips and penetration through the weak interlayer and hard rock layers. The propagation path is jointly influenced by the fracture dip angle, bridging angle, and the activation state of interlayer shear slip. This study reveals that when the double fissure layout (rock bridge dip angle) is oriented opposite to the dip direction of the weak interlayer, the pillar system is most susceptible to penetrating shear instability failure. Meanwhile, an increase in the bedding dip angle promotes slip along the weak interlayer, which reduces mechanical anisotropy and results in lower overall strength. These findings provide a theoretical reference for optimizing the layout and targeted support design of pillars in multi-layered stratified ore bodies, such as phosphate mines.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105471"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146078521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Failure morphologies in grouted and ungrouted double fissured specimens: experiments and SPH simulations","authors":"Ting Jiang ,&nbsp;Jilin Wang ,&nbsp;Mengyao Shen ,&nbsp;Wenbing Zhang ,&nbsp;Shuyang Yu","doi":"10.1016/j.tafmec.2026.105472","DOIUrl":"10.1016/j.tafmec.2026.105472","url":null,"abstract":"<div><div>To reveal the mechanisms associated with the fracture of grouted and ungrouted double-fissured rock masses, crack propagation of double-fissured rock masses with different dip angles <em>α</em> is studied by combining experiments and numerical simulations. Rock-like samples are produced through sand-based three-dimensional printing technique, and grouted/ungrouted double-fissured models were constructed through cement grouting. Uniaxial compression experimentation and DIC technology are adopted to evaluate the damage modes and stress-strain properties. A modified particle-based model was established by embedding a particle failure treatment method into SPH method, which reproduces the crack evolution process and is validated against experimental results. The research indicates that mechanical responses of specimens are highly consistent with that of natural sandstone, enabling effective simulation of rock mass properties. Modified SPH method is able to precisely capture interface debonding between grout and rock mass as well as the dynamic crack evolution. For ungrouted specimens, with the rise in fracture dipping angle, the crack initiation position shifts from the middle of the fissures to the outer tips, forming “wing cracks”, and the inner tips tend to directly coalesce. After grouting, peak strength significantly enhanced (with the maximum improvement of 126.9% at <em>α</em> = 0°), the concentrated stress effect is diminished, the crack path transitions to passing the grout, the localized tensile stress zone moves from fissure tips to the interior of the grout. The present research offers experimental and numerical fundamentals for elucidating the mechanical response of grouting-reinforced double-fissured rock masses, meanwhile provides important reference value for stability control in rock engineering.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105472"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design net cross-section resistances for numerical design analyses of weakened tensile plates with real material properties","authors":"Kirill Golubiatnikov ,&nbsp;Martin Vild ,&nbsp;Frantisek Wald","doi":"10.1016/j.tafmec.2026.105466","DOIUrl":"10.1016/j.tafmec.2026.105466","url":null,"abstract":"<div><div>Design net cross-section resistances for numerical design analyses of weakened tensile plates with real material properties have been established. Datasets of possible resistances for each considered geometry type were generated using a Monte Carlo-based procedure, combining a numerical-analytical approach with statistical functions of real material properties and real thicknesses reported in the literature. The generated datasets and the applied numerical - analytical approach were validated against experimental results. Subsequently, the datasets were statistically evaluated in accordance with EN 1990, and design net cross-section resistances with partial safety factors for tensile resistance were determined. The maximum obtained partial safety factor is 1.22, closely matching the recommended value of 1.23 reported in the literature. The most critical geometry types were smooth double notches, round double notches, and either sharp double notches or a narrow slotted hole. Plates with single holes or slotted holes exhibit lower design resistance than comparable double-notch plates. Additionally, staggered holes reduce resistance, whereas multiple holes in line have little effect. The results provide statistically guaranteed criteria suitable for numerical design analyses with real material properties and support harmonization with Eurocode-based practice.</div><div>The findings of this study, particularly the derived design resistances, form a foundation for establishing design failure criteria for numerical design calculations performed with nominal material properties and nominal geometry in a future study.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105466"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiscale characterization of crack-tip plasticity and overload retardation in X80 pipeline steel under variable amplitude loading","authors":"Min Lou ,&nbsp;Gezhanpeng Li ,&nbsp;Yangyang Wang ,&nbsp;Bin Wu ,&nbsp;Siyuan Wen ,&nbsp;Chen Zhang","doi":"10.1016/j.tafmec.2026.105493","DOIUrl":"10.1016/j.tafmec.2026.105493","url":null,"abstract":"<div><div>The fatigue behavior of the X80 pipeline steel under variable amplitude loading (VAL) in marine environments is critical for safely operating the offshore oil and gas transportation pipelines, such as risers. Therefore, a macro–micro multiscale analysis model (MMMA), which integrated crystal plasticity finite element method (CPFEM) and extended finite element method (XFEM), was proposed to characterize crack-tip plasticity and the associated micro-scale deformation mechanisms during VAL-induced crack growth. The macroscopic FCP characteristics of X80 pipeline steel under VAL were experimentally validated. This study clarified the macroscale evolution of the crack-tip plastic zone and the associated residual-stress field under VAL, and investigated the subgrain-scale distribution of intragranular slip-induced damage ahead of the crack tip, thereby elucidating overload retardation and its loading-sequence sensitivity through a consistent macro–micro linkage. The results demonstrated that overload induces residual plastic deformation and a compressive residual-stress field at the crack tip, leading to crack-growth retardation. Increasing the overload ratio (<em>R</em>_ol) aggravates strain and intragranular slip heterogeneity, which strengthens the overload retardation. Different loading sequences determine retardation by altering slip tendency and recovery rates, with the single-peak overload followed by underload (OL–UL) more effectively suppressing overload-enhanced intragranular slip and reducing retardation than the single-peak underload followed by overload (UL–OL).</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105493"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the mixed mode I/III fracture behavior of autoclaved aerated concrete","authors":"M. Ghadim-Ghobadi ,&nbsp;S. Pirmohammad ,&nbsp;M. Bakhshizadeh","doi":"10.1016/j.tafmec.2026.105476","DOIUrl":"10.1016/j.tafmec.2026.105476","url":null,"abstract":"<div><div>This study examined fracture behavior of Autoclaved Aerated Concrete (AAC) using a newly developed Modified Edge Notched Disc Bend (MENDB) specimen under five distinct loading conditions, including pure mode I, pure mode III, and three mixed-mode I/III states. The traditional ENDB geometry was prone to premature failure in porous materials due to excessive stress concentration at the supports. To overcome this limitation, the MENDB configuration incorporated truncated supports that prevented crushing near contact regions and allowed accurate fracture testing across a wide range of crack orientations. A finite element (FE) parametric study was conducted to quantify the influence of support span ratio (<em>S/R</em> = 0.7–0.9), crack length ratio (<em>a/B</em> = 0.4–0.6), and crack angle (<em>α</em> = 0°–75.5°) on the geometry factors (<em>Y</em>_I, <em>Y</em>_III) and normalized T-stress. The FE results indicated that increasing <em>α</em> progressively shifted the loading condition from pure mode I to pure mode III; meanwhile, larger <em>S/R</em> values enhanced <em>Y</em>_I at low <em>α</em> but reduced it at higher angles, while <em>Y</em>_III consistently increased with <em>S/R</em>. In contrast, increasing <em>a/B</em> raised <em>Y</em>_I at small <em>α</em> but decreased it for dominant mode III conditions. Furthermore, experiments showed that the fracture resitance (<em>K</em>_f) decreased with increasing mode III contribution, with pure mode III <em>K</em>_f being approximately 61% lower than pure mode I one.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105476"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146078169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on crack propagation law and plastic failure mechanism around extraction borehole","authors":"Yongzan Wen ,&nbsp;Wei Yang ,&nbsp;Mengfei Song ,&nbsp;Tianfu Wang ,&nbsp;Yihan Wang ,&nbsp;Minghua Lin","doi":"10.1016/j.tafmec.2026.105462","DOIUrl":"10.1016/j.tafmec.2026.105462","url":null,"abstract":"<div><div>The evolution of cracks and the formation of plastic failure zones around boreholes constitute crucial seepage channels for efficient gas extraction. To investigate the crack propagation behavior and plastic failure mechanisms surrounding boreholes, cubic coal specimens with various spatial configurations were tested. The surface strain field evolution during uniaxial compression tests was monitored using the Digital Image Correlation (DIC) technique. Combined with elastoplastic mechanics theory, a computational model for the plastic zone boundary around boreholes was established to explore the influencing factors of the plastic region. The results show that circular boreholes, as initial defects, significantly deteriorate the mechanical properties of coal specimens. Both uniaxial compressive strength and elastic modulus decrease markedly with an increasing number of boreholes. The evolution of “butterfly-shaped” strain concentration zones around boreholes dominates crack initiation and propagation, while the superposition of strain fields among multiple boreholes is the primary cause of accelerated degradation of the specimens. Furthermore, the cooperative interaction among multiple boreholes expands the influence range of the plastic zones. Theoretical analysis indicates that under deviatoric stress conditions, a “butterfly-shaped” plastic zone forms around the borehole, with the butterfly lobes oriented at approximately <em>θ</em> ≈ 45°, representing preferential zones for shear crack development. The extent of the plastic zone is positively correlated with the borehole radius and lateral pressure coefficient, but negatively correlated with coal cohesion and internal friction angle. The butterfly-shaped plastic zone around the borehole defines the “effective permeability enhancement zone” for gas extraction. Utilizing the superposition effect of plastic zones induced by multi-borehole disturbance can extend the permeability enhancement range and enlarge the fracture connectivity region, thereby providing a theoretical basis for optimizing the borehole layout in gas drainage operations.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"143 ","pages":"Article 105462"},"PeriodicalIF":5.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146078396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}