International Journal of Mechanical Sciences最新文献

{"title":"Strain-rate-dependent interlaminar shear properties of 3D FWP-C/C composites","authors":"Fei Guo,&nbsp;Xueli Zhang,&nbsp;Ming Qiu,&nbsp;Longmiao Chen","doi":"10.1016/j.ijmecsci.2025.110523","DOIUrl":"10.1016/j.ijmecsci.2025.110523","url":null,"abstract":"<div><div>Three-dimensional fine weave pierced carbon/carbon (3D FWP-C/C) composites are widely employed in critical aerospace thermal structures due to their exceptional high-temperature mechanical properties. However, these structures inevitably operate in complex dynamic environments, where the relatively weak interlaminar mechanical properties of 3D FWP-C/C composites make them particularly susceptible to dynamic interlaminar shear (ILS) failure. In this study, a double-shear specimen is specifically designed and size-optimized to evaluate the ILS properties of 3D FWP-C/C composites. Quasi-static and dynamic experiments are conducted using an electromechanical universal testing machine and a servo-hydraulic high-speed testing machine, respectively. The fracture surfaces are subsequently analyzed via scanning electron microscopy (SEM) to reveal the strain-rate-dependent ILS failure mechanism. Results demonstrate that the ILS failure in 3D FWP-C/C composites is primarily governed by pierced fiber bundles. Under quasi-static loading, the ILS failure occurs due to the tensile rupture of the pierced fiber bundles, whereas at high strain rate loading, failure is primarily governed by the shear fracture of the pierced fiber bundles. With increasing strain rate, the ILS strength improves, rising from 22.738 MPa at 0.001/s to 30.859 MPa at 1000/s, while the initial ILS modulus remains nearly unchanged. This enhancement is attributed to the suppressed propagation of matrix cracks at higher strain rates. The ILS failure process of 3D FWP-C/C composites exhibits two distinct stages: the matrix-dominated first damage stage and the fiber-dominated second damage stage. Additionally, the two damage stages gradually converge with increasing strain rate. Based on these findings, a novel strain-rate-dependent dual-damage ILS constitutive model, incorporating both damage stages, is proposed and validated against experimental data. The proposed constitutive model provides precise predictive capabilities for both dynamic ILS responses and progressive failure modes in aerospace 3D FWP-C/C composite structures under operational dynamic loading conditions.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110523"},"PeriodicalIF":7.1,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 cutting tool wear data-physics fusion-driven monitoring method","authors":"Xiaohui Fang ,&nbsp;Qinghua Song ,&nbsp;Xiaoxuan Li ,&nbsp;Liguo Zhang ,&nbsp;Xiaojuan Wang ,&nbsp;Haifeng Ma ,&nbsp;Yicong Du ,&nbsp;Zhanqiang Liu","doi":"10.1016/j.ijmecsci.2025.110526","DOIUrl":"10.1016/j.ijmecsci.2025.110526","url":null,"abstract":"<div><div>Tool wear monitoring (TWM) serves as a bridge between process information and tool condition. However, existing monitoring methods encounter limitations regarding long-term monitoring performance, and a single feedforward fusion approach often fails to consistently deliver high-precision predictions and reliable maintenance s1ort. In this paper, a TWM method based on Transformer-GRU and particle filter (TG-PF) driven by data-physics is proposed. Specifically, deep-level features are extracted from multi-source signals, and feature fusion is performed to accurately capture the tool's state changes. Based on the Transformer-GRU model, the mapping relationship between the historical series and the future tool wear is established, with the wear value obtained from the Transformer-GRU model serving as the observed value. The parameters of the physical model are updated during each iteration of the particle filter to achieve the fused prediction result. The fusion method incorporates a closed-loop dynamic error correction mechanism, mitigating long-term error accumulation and reducing prediction uncertainty. The TWM experiments conducted on thin-walled and rectangular block parts demonstrate that the prediction error of the fusion method is reduced by 19.19 % and 43.36 %, respectively, when compared to the single data-driven method, and the TG-PF method outperforms 11 advanced TWM methods. The fusion method leverages historical data and incorporates a dynamic updating mechanism, serving as a crucial approach to enhancing accuracy and mitigating uncertainty in long-term TWM.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110526"},"PeriodicalIF":7.1,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extraordinary specimen-size effect on long-life fatigue of additively manufactured AlSi10Mg","authors":"Xiangnan Pan ,&nbsp;Zhiqiang Tao ,&nbsp;Xu Long","doi":"10.1016/j.ijmecsci.2025.110524","DOIUrl":"10.1016/j.ijmecsci.2025.110524","url":null,"abstract":"<div><div>It is well known that the mechanical properties of materials are strongly influenced by the size of the testing specimens, especially for the defect-induced high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) of high-strength alloys with failure cycles beyond 10⁷. Typically, this phenomenon of specimen-size effect becomes more pronounced as the fatigue life extends, and the fatal fatigue-crack initiates within a risk domain of control volume <em>V</em>₉₀ where the applied stress is equal or larger than 90 % of the nominal one.</div><div>Here, for the first time, we report a newly observed specimen-size effect on fatigue behavior of an additively manufactured aluminium alloy (AlSi10Mg) produced by powder bed fusion - laser beam. Fatigue tests were precisely conducted by ultrasonic cycling at a resonant frequency of 20 ± 0.5 kHz under a stress ratio <em>R</em> = –1 at room temperature and in ambient air. Five types of specimens with minimal diameters of 3.5, 5.3, 8.1, 12.25 and 18.6 mm were tested. As specimen size increases, the HCF resistance drops sharply and exhibits a large scatter, whereas the VHCF limit degrades only slightly. For small-sized types, fatal crack initiates at specimen surface, subsurface or interior with the increasing failure cycles. But for large-sized types, fatal crack nucleates frequently in specimen interior even with “fish eye” morphology in HCF regime. Furthermore, the crack initiation site gradually tends to shift beyond the control volume part with the increase of specimen size, making the concept of <em>V</em>₉₀ challenging for large-sized specimens, regardless of fatigue lives.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110524"},"PeriodicalIF":7.1,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clarifying the viscous relaxation mechanism for twisting carbon nanotube ribbons","authors":"Xiaoping Hu ,&nbsp;Yuxuan Zheng ,&nbsp;Jie Tian ,&nbsp;Pengfei Wang","doi":"10.1016/j.ijmecsci.2025.110522","DOIUrl":"10.1016/j.ijmecsci.2025.110522","url":null,"abstract":"<div><div>Twisted carbon nanotube (CNT) fibers have emerged as promising candidates for actuators and artificial muscles due to their excellent mechanical properties, offering significant potential in mechanical engineering and intelligent medical applications. Despite this promise, the effects of twisting on the viscous mechanical behavior of CNT fibers and their composites, particularly the evolution of their microstructure and time-dependent relaxation behavior, remain insufficiently understood. This study addresses this gap by conducting single and multiple stress relaxation experiments on untwisted ribbons and twisted CNT fibers. The findings reveal greater stress relaxation in CNT ribbons compared to twisted fibers, attributed to the microstructural constraints introduced by twisting. A viscoelastic model was developed to accurately capture the experimental stress-time curves and provide theoretical derivations of the stress-strain relationships for CNT ribbons and fibers. Additionally, numerical simulations elucidate the underlying viscous mechanisms, demonstrating that the intrinsic viscosity driving stress relaxation governs the time-dependent stress behavior and strain-rate sensitivity of the assembly. The study further highlights the critical role of twisting in shaping relaxation behavior, emphasizing the influence of enhanced interface interactions. Loading-unloading experiments on single and quadruple CNT fibers reveal that interface constraints significantly affect stress relaxation and rate sensitivity, offering new insights into the interplay between microstructural dynamics and mechanical performance. This work advances our understanding of the time-dependent properties of CNT fibers and provides a foundation for designing high-performance CNT-based materials for long-term applications.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110522"},"PeriodicalIF":7.1,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How does electromigration induce fracture of IMC in solder joints?","authors":"Xin-Wei Wu ,&nbsp;Mingyang Chen ,&nbsp;Liao-Liang Ke","doi":"10.1016/j.ijmecsci.2025.110477","DOIUrl":"10.1016/j.ijmecsci.2025.110477","url":null,"abstract":"<div><div>Fracture is commonly observed in intermetallic compounds (IMCs) in the solder joints of flip-chip packages after serving for a certain period of time, with electrical and mechanical loadings applied. How the electromigration effect undermines the performance of IMCs in solder joints and eventually leads to structural fracture remains unclear. In this paper, a phase-field model coupling both mechanisms of electromigration and facture is proposed, which could resolve the full evolving process of defects from the early-stage mass diffusion by electromigration to the final failure by fracture. The model is carefully validated by comparing it with other celebrated electromigration and fracture models. Using this model, the evolution process of two typical defects, the void-like defect and crack-like defect, are analyzed in detail under different electrical and mechanical loadings. We find that electromigration induces fracture of solder joints by the mechanism that mass diffusion caused by electromigration helps to enlarge the defects and develop sharp corners at the defect surfaces, leading to the local stress concentration and crack initiation. Comparison among different models shows that the lifetime of solder joints is co-governed by the electromigration and fracture processes and simply dropping either mechanism leads to overestimation of the lifetime.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110477"},"PeriodicalIF":7.1,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Data-driven deep learning for predicting ligament fatigue failure risk mechanisms","authors":"Datao Xu ,&nbsp;Huiyu Zhou ,&nbsp;Tianle Jie ,&nbsp;Zhifeng Zhou ,&nbsp;Yi Yuan ,&nbsp;Monèm Jemni ,&nbsp;Wenjing Quan ,&nbsp;Zixiang Gao ,&nbsp;Liangliang Xiang ,&nbsp;Fekete Gusztav ,&nbsp;Meizi Wang ,&nbsp;Justin Fernandez ,&nbsp;Julien S. Baker ,&nbsp;Yaodong Gu","doi":"10.1016/j.ijmecsci.2025.110519","DOIUrl":"10.1016/j.ijmecsci.2025.110519","url":null,"abstract":"<div><div>The pathogenesis of musculoskeletal disorders is closely associated with the cumulative damage and fatigue failure behavior of fibrous connective tissues under long-term repetitive loading. However, significant technological challenges remain in real-time dynamic monitoring of ligament fatigue life, particularly the lack of efficient computational mechanics modeling frameworks and precise assessment tools adaptable to real-world movement scenarios. The multimodal integrated framework for ligament fatigue life assessment was proposed in this study. First, the high-accuracy subject-specific musculoskeletal models were developed based on individualized medical imaging data. A coupled hyperelastic-viscoelastic constitutive model was incorporated to accurately characterize the nonlinear mechanical behavior of ligamentous tissues and their fatigue damage evolution under cyclic loading. Furthermore, by integrating continuum damage mechanics theory, a time-dependent cumulative damage evolution equation was established to systematically quantify the coupling relationship between fatigue failure probability and dynamic mechanical loading. In the data-driven prediction module, an innovative deep-learning model that integrates kinematic-dynamic coupling was developed. By integrating wearable inertial measurement units, the model enables real-time inversion of ligament loading force-fatigue failure states and prediction of fatigue life. This approach effectively overcomes the limitations of traditional mechanical modeling in long-term, multi-scenario dynamic monitoring, achieving high-precision and minimally invasive fatigue life evaluation of ligaments. The proposed computational framework breaks the static-loading constraints of conventional fatigue testing, achieving the dynamic biomechanical analysis and fatigue life prediction under real movement conditions. This work not only provides novel theoretical insights into the mechanisms and modeling of ligament fatigue damage, but also provides a generalizable tool for biomechanical injury prevention, rehabilitation planning, and soft tissue fatigue analysis in the musculoskeletal system.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110519"},"PeriodicalIF":7.1,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decoupled design of hybrid mechanical metamaterials via ensembled deep learning","authors":"Yujie Xiang ,&nbsp;Jixin Hou ,&nbsp;Xianyan Chen ,&nbsp;Keke Tang ,&nbsp;Xianqiao Wang","doi":"10.1016/j.ijmecsci.2025.110514","DOIUrl":"10.1016/j.ijmecsci.2025.110514","url":null,"abstract":"<div><div>Regarding the design of mechanical metamaterials, both periodic unit cells and irregular structures with specific continuity have demonstrated promising application potential. More importantly, material distribution-based design methods also provide a representative perspective. However, existing studies rarely associate mature unit cells with irregular structures while simultaneously considering the influence of material distribution. This hybrid design problem warrants further investigation and holds significant potential for expanding the design space of mechanical metamaterials. This study proposes an inverse design strategy capable of accounting for diverse unit cells and multiple materials in a sole metamaterial design with targeted macroscopic mechanical stiffness. An ensembled deep learning model with variational autoencoders and artificial neural networks is constructed to decouple structural and material contributions to overall mechanical properties, which facilitates the independent design of unit cell and material distribution for targeted properties. Integrating the virtual growth algorithm, the proposed method addresses critical challenges in geometric continuity among various types of unit cells. Accurate reconstruction and prediction of hybrid distributions are realized, with SHAP analysis confirming effective decoupling of structural and material influences on the targeted metamaterial design. Final design targets show excellent accuracy of homogenized properties, indicating the efficacy of our approach. The proposed workflow pioneers a novel decoupled approach for designing mechanical metamaterial with hybrid unit cells and multiple materials, setting a foundation for applications in complex mechanical systems and complicated inverse design problems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110514"},"PeriodicalIF":7.1,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-modal multi-response seismic mitigation with amplified inerter negative stiffness dampers","authors":"Ning Su ,&nbsp;Long Qin ,&nbsp;Cong Zeng ,&nbsp;Zhaoqing Chen ,&nbsp;Zhuo Xu ,&nbsp;Yi Xia ,&nbsp;Jing Bian","doi":"10.1016/j.ijmecsci.2025.110516","DOIUrl":"10.1016/j.ijmecsci.2025.110516","url":null,"abstract":"<div><div>This study develops an innovative seismic control system that integrates Scissor-jack Toggle-brace amplification mechanisms with Tuned Inerter Negative Stiffness Dampers (TINSDs) to address unresolved challenges in multi-modal multi-response targeted vibration mitigation. First, a novel equivalent amplification factor was proposed to provide a unified metric considering both device amplification and inter-story installation effects, enabling efficient reduced-order modeling and optimal design. Second, closed-form <em>H</em>_∞/<em>H</em>₂ solutions were rigorously derived, which reveals inherent Pareto-optimal performance trade-offs across displacement, acceleration, and force transmissibility response targets. Third, a novel method integrating Master Oscillator Principle (MOP) and Pareto optimization was proposed. By decomposing the complex problem into optimally allocated damper groups, simultaneous control of fundamental-mode displacements and higher-mode accelerations/reaction forces was achieved. Benchmark validation studies demonstrate remarkable performance improvements compared to conventional single-modal approaches. The proposed system achieves significant reductions in total required inertance and damping coefficients while maintaining comparable displacement control effectiveness and significantly enhancing acceleration and reaction force mitigation. Furthermore, a practical rule-of-thumb allocation strategy featuring progressive base-to-top targeting of lower-to-higher modes with decreasing device density was developed, which shows statistically equivalent performance Pareto-optimized solutions (<em>p</em>&gt;0.05). The proposed framework offers both sophisticated control algorithms for researchers and implementable guidelines for engineers.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110516"},"PeriodicalIF":7.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear dynamics of rotor-support-casing system with support looseness fault","authors":"Wenpeng Jiang ,&nbsp;Kaikai Liu ,&nbsp;Xin Yuan ,&nbsp;Hongrui Cao ,&nbsp;Jianghai Shi ,&nbsp;Qinghua Qin","doi":"10.1016/j.ijmecsci.2025.110482","DOIUrl":"10.1016/j.ijmecsci.2025.110482","url":null,"abstract":"<div><div>This paper proposes a time-domain numerical method combining explicit and implicit schemes for efficiently solving high-dimensional systems with localized nonlinearities. This method is applied to investigate the nonlinear dynamic characteristics of a rotor-support-casing system with support looseness fault. A dynamic model incorporating multi-interface nonlinear supports is developed, which includes nonlinear bearings, a squeeze film damper (SFD), and the contact interaction between the bearing and its housing. The model is validated through modal testing and vibration response experiments. To obtain the vibration response of the system, a hybrid numerical integration method is proposed, with its core focused on optimizing the iterative solution process. This method separates the linear and nonlinear parts of the system, predicts the coupling node response using an explicit scheme, and solves the linear and nonlinear parts using an implicit numerical method and a quasi-Newton iterative algorithm, respectively. Compared with conventional approaches, this method significantly improves computational efficiency. Subsequently, the effects of rotor speed, fit clearance, and oil film clearance in SFD on the dynamic response of the rotor-support-casing system under support looseness faults are investigated. The results show that support looseness alters system stability, leading to periodic, multi-periodic, and quasi-periodic responses. Both fit clearance and oil film clearance significantly influence the system’s nonlinear behavior. Under serious fault conditions, fractional-order rotational speed harmonics appear in the casing vibration response. The proposed modeling approach and hybrid numerical method demonstrate strong potential for engineering applications in aero-engine vibration prediction.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110482"},"PeriodicalIF":7.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytical model for predicting induced-stress distributions in polycrystalline materials","authors":"T. Mede,&nbsp;S. El Shawish","doi":"10.1016/j.ijmecsci.2025.110470","DOIUrl":"10.1016/j.ijmecsci.2025.110470","url":null,"abstract":"<div><div>A simple micromechanical model of polycrystalline materials is proposed, which enables us to swiftly produce grain-boundary-stress distributions induced by the uniform external loading (in the elastic strain regime). Such statistical knowledge of local stresses is a necessary prerequisite to assess the probability for intergranular cracking initiation. Model predictions are verified through finite element calculations for various loading configurations, material properties, and grain-boundary types specified by the properties of a bicrystal pair of grains enclosing the grain boundary.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110470"},"PeriodicalIF":7.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}