International Journal of Impact Engineering最新文献

{"title":"Shear localization as a damage mechanism in pore collapse under shock compression","authors":"Z. Lovinger ,&nbsp;R. Kositski","doi":"10.1016/j.ijimpeng.2024.105039","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105039","url":null,"abstract":"<div><p>The effect of porosity in shock-compressed materials is widely studied in the literature, accounting for its contribution to the materials' compressibility and to shock attenuation. Yet, the role of porosity in damage or failure under shock compression is limitedly addressed. In this work, shear localization resulting from pore collapse is studied, in potential relation to damage and failure under shock compression. Ti-6Al-4V specimens, with cylindrical and spherical pores, were manufactured using additive manufacturing (AM), and a soft catch set-up was used to enable post-mortem analysis of the impacted specimens. Under plate impact experiments, at shock pressures of 3–8 GPa, the 1–2 mm voids demonstrated collapse, followed by the evolution of shear bands (SB), emanating from the pore's surface. Samples with multiple pores were also tested to examine the interaction of shear bands between adjacent pores, to coalesce to larger damage surfaces. Varying the impact velocity and corresponding impact pressures, protracted states of SB evolution were studied. Numerical simulations using a material damage model reproduced many of the experimentally demonstrated phenomena. The presented results suggest evidence that shear localization around pores could be a damage mechanism under shock compression, identified as a threshold effect, making it a significant mechanism to be well characterized. The applicability of this mechanism is examined in relation to damage behavior under shock compression, extrapolating the experimental findings to μm-sized pores at high pressures.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539171","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 of a continuously repeated impact method with constant amplitude based on Hopkinson bar: Principle and impact fatigue life testing","authors":"Sihan Zhao ,&nbsp;Boli Li ,&nbsp;Kangbo Yuan ,&nbsp;Weiguo Guo ,&nbsp;Penghui Li ,&nbsp;Ruifeng Wang ,&nbsp;Jianhui Yang ,&nbsp;Meng Gao","doi":"10.1016/j.ijimpeng.2024.105038","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105038","url":null,"abstract":"<div><p>The lack of reliable testing methods and standards hinders systematic research on the impact fatigue performance of materials. The aim of developing an impact fatigue test method is to generate repeated impact loads with a constant amplitude, which is difficult to achieve using various existing impact test devices. This study investigated the principles of cyclic loading-resetting and constant-amplitude loading based on the split Hopkinson pressure bar (SHPB) system, established a novel impact fatigue test device, and verified the developed method by testing the impact fatigue life of a Ti-6Al-4V alloy. Electromagnetic valves, laser sensors, and a vacuum pump were used in the developed device to launch and reset the striker bar; a servo motor and laser sensors were used to reset the loading bars and specimen, and the entire system was controlled by a programmable controller to achieve continuously repeated loading. To achieve constant-amplitude loading, the conditions required to ensure that the specimen moves away from the incident bar before the returning stress wave reloads the specimen was derived. It was found that a constant-amplitude repeated impact on the specimen could only be achieved through the precise design of the geometric configuration and material of the loading bars. This method is considerably simpler than various existing methods based on energy absorption and is more applicable to impact fatigue tests. The verification tests showed that the highest loading frequency of the device was 0.5 Hz, the loading rate exceeded 10⁵ kN/s, and the amplitude error of the repeated impact loads did not exceed 2.45 %. Under loads with the same amplitude, the impact fatigue life of a Ti-6Al-4V alloy was considerably shorter than the non-impact (low strain rate) fatigue life, which indicates the necessity of investigating the strain rate effect on the fatigue performance of materials.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539386","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":"Experimental and numerical study on the ballistic performance of laminated ceramics","authors":"Metehan Cura ,&nbsp;Hamed Tanabi ,&nbsp;Baris Sabuncuoglu","doi":"10.1016/j.ijimpeng.2024.105032","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105032","url":null,"abstract":"<div><p>The ballistic performances of laminated ceramics were investigated experimentally and numerically and then compared with monolithic ceramics. Sixteen ceramic configurations were generated using two geometry types (hexagonal and square) and combination of three ceramic materials (Al₂O_3, SiC, and B₄C). Depth of Penetration ballistic tests were employed to evaluate their ballistic performance. According to the results, monolithic ceramic has higher ballistic performance than all laminated ceramic combinations. In laminated ceramics, using thicker ceramic on the strike-face increases the ballistic efficiency more than using it on the backing face. In addition, when a backing-face ceramic is combined with a more efficient strike-face ceramic, the ballistic performance is better than combination of same ceramic material. Lastly, finite element analysis were performed to simulate some of the tested configurations having SiC ceramic type. A similar trend was observed between the simulations and the tests.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539172","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":"Experimental investigation on the damage accumulation mechanism of 3D orthogonal woven composites under repeated low-velocity impacts","authors":"Zhiping Ying ,&nbsp;Haiyang Chen ,&nbsp;Zebin Zhu ,&nbsp;Zhenyu Wu ,&nbsp;Lin Shi ,&nbsp;Xiaoying Cheng","doi":"10.1016/j.ijimpeng.2024.105035","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105035","url":null,"abstract":"<div><p>This paper presents an experimental investigation into the response of carbon fiber reinforced composites with various fiber architectures to repeated low-velocity impacts. Mechanical response diagrams, including repetition numbers and damage morphologies of the composite samples, are provided. Varied energy levels (20 J, 35 J, 50 J) and impact numbers (up to 30th) are considered to induce perforated damage in the composite samples. It is found that the mechanical responses of the composite samples under repeated impact events exhibit distinct characteristics in terms of impact threshold and stiffness degradation. The 2D unidirectional (2DUD) laminated composite sample exhibits a high impact threshold during impact events but stiffness rapidly decays after an initial substantial decline. The 2D plain woven (2DPW) laminated composite sample accumulates impact damage at both high and low levels, resulting in a gradual stiffness decrease during impact events. In addition, the 3D orthogonal woven (3DOW) composite sample demonstrates a higher impact threshold with its stiffness gradually decreasing under high-level impacts. In contrast, both 2DUD and 2DPW composite samples exhibit extensive plastic deformation of the resin matrix with minimal fiber fracture, enabling efficient dissipation of impact energy. Conversely, the 3DOW composite sample primarily dissipates impact energy through fiber fracture. Additionally, it is noteworthy that while both 2DUD and 2DPW composites demonstrate enhanced robustness against repeated impacts at low-energy levels, a significant improvement in durability is observed specifically for the 3DOW composite under high-energy level impacts.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481599","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 novel hydro-elastoplastic constitutive model incorporating hydrostatic damage for predicting high-pressure performance of concrete under blast loading","authors":"Lei Yan ,&nbsp;Li Chen ,&nbsp;Qin Fang","doi":"10.1016/j.ijimpeng.2024.105037","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105037","url":null,"abstract":"<div><p>The evolution of damage and failure modes of concrete under blast or impact loads are the outcomes of stress wave propagation. The stress state at a point within the concrete changes instantaneously with time and space. Establishing a constitutive model that can cover the nonlinear behavior of materials under complex loading paths and histories is an extremely challenging task. The main difficulty lies in the construction of the damage model, which has not yet been fully resolved in commonly used concrete models. This paper, based on the mechanisms of damage and failure of concrete under hydrostatic pressure, constructs a state equation that includes the description of crushing and compaction damage due to the collapse and closure of pores, as well as their interactive model, negative pressure degradation caused by hydrostatic pressure, and nonlinear volumetric behavior under loading/unloading/reloading. By introducing independent shear and tensile deviatoric damage scaling functions and a damage scaling function under isotropic tension, the coupling relationship between deviatoric and volumetric damage is considered. Corresponding strength models and element erosion criteria are developed based on the new state equation and damage models. Then, single-element numerical experiments of unconstrained uniaxial compression and tension, triaxial compression under different confining pressures, monotonic and cyclic hydrostatic compression, and isotropic tension were conducted to verify the predictive accuracy of the proposed model under single loading paths. Finally, numerical experiments of contact explosion on plain concrete thick and thin targets were carried out using the proposed model, revealing the propagation laws and failure processes of the loading compression wave, unloading tensile wave, and reflected tensile wave within the concrete target. The predicted final failure modes are consistent with the experimental results.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141485805","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":"Development of a test specimen carrier for the Taylor anvil test using 3D additive printing technology","authors":"Miroslav Jopek,&nbsp;Samuel Muller,&nbsp;Jan Rihacek","doi":"10.1016/j.ijimpeng.2024.105026","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105026","url":null,"abstract":"<div><p>Dynamic material testing is increasingly crucial for establishing a comprehensive description of material models. One of the primary testing methods is the Taylor Anvil Test (TAT). In this test, strain rates of up to 10⁵ s⁻¹ can be achieved at impact speeds of 250 m/s. Proper evaluation of a specific material specimen in this test relies on delivering the test specimen to the impact point both centrally and perpendicularly, as well as at the moment of reaching the maximum impact speed. This Article addresses the development of a new carrier for round test specimens manufactured using additive 3D printing technology from a polyactide polymer adapted for the TAT device with a calibre of 17 mm. The Article closely examines the influence of geometric parameters of the carrier itself, optimized using the Ansys Fluid Flow software, with a focus on internal ballistics, particularly to achieve perpendicular impact and maximum impact speed without causing the destruction of the carrier. A new type of test carrier was designed and subsequently tested for round test specimens made of the aluminium alloy Al 2024-T3, evaluating both the impact speeds of the carrier under identical initiation pressure parameters in the filling chamber and the impact speed parameters of the specimen, respectively, the strain rate of the test specimen.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0734743X24001507/pdfft?md5=d54fb2cb830073ee55a753047a570cef&pid=1-s2.0-S0734743X24001507-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141429457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and theoretical study of cone angle in alumina tiles under ballistic impact","authors":"Shanglin Yang ,&nbsp;Longkun Lu ,&nbsp;Yue Gao ,&nbsp;Yizhi Zhang ,&nbsp;Tao Wang ,&nbsp;Zhanli Liu","doi":"10.1016/j.ijimpeng.2024.105025","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105025","url":null,"abstract":"<div><p>The ceramic cone formed within the ceramic tiles provides effective ballistic resistance. Although the critical velocity of ceramic cone formation has been extensively studied, the cone angle in ceramic tiles after crack initiation is still unclear, which is important for understanding the anti-penetration process. In this paper, the cone angle in ceramic tiles is systematically investigated both experimentally and theoretically. First, the dynamic failure process of ceramic tiles is characterized by means of ballistic impact experiments, and the results show that the cone angle gradually decreases with the increase of the thickness of the ceramic tile, while it is independent of the impact velocity. Then, based on the minimization of deformation energy and fracture energy, a theoretical model is established for the first time to predict the cone angle, which takes into account the strain rate effect on tensile strength. This model can well explain the effect of the thickness, impact velocity and fracture properties of the ceramic material on the cone angle obtained in experiments. Increasing the thickness of the ceramic tiles results in larger ceramic fragments while the generated fracture energy declines. This leads to a decrease in the cone angle. Moreover, an increase in the fracture toughness or tensile strength of the ceramic material enhances the resistance to crack propagation, and the generated fracture energy decrease, resulting in a decrease in the cone angle. However, the cone angle does not change much with impact velocity because the impact velocity does not change the stress field distribution of the ceramic tile. This study is meaningful for understanding the ballistic resistance of ceramic tiles.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141485804","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":"Low-velocity impact responses and failure of sandwich structure with carbon fiber composite honeycomb cores","authors":"Yan Wang ,&nbsp;Xingyu Wei ,&nbsp;Zhibin Li ,&nbsp;Cheng Gong ,&nbsp;Pengcheng Xue ,&nbsp;Jian Xiong","doi":"10.1016/j.ijimpeng.2024.105034","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105034","url":null,"abstract":"<div><p>The objective of this study is to examine the response and failure of honeycomb sandwich structures made of carbon fiber reinforced polymer (CFRP) composites under low-velocity impacts. Four impact tests with varying energies are performed to induce four distinct damage states in the sandwich structure: no discernible damage, damage to the top face sheet and a portion of the core, damage to the lower face sheet, and total penetration. The damage characteristics of the sandwich structures is analyzed by using industrial tomography technology (CT) without destroying them. A refined finite element model is established to further explain the deformation behavior and energy absorption mechanism of the structure, clarifying the effects of the honeycomb core's structural parameters, such as wall thickness, cell side length, and core height. To enhance the precision of simulation outcomes, a model for the onset and progression of damage in plain woven composites is incorporated into the user-defined material subroutine. The experiments and simulations demonstrate a high level of consistency in terms of peak loads, failure mode, and energy absorption.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141429856","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":"Dynamic response characteristics and damage calculation method of fractured rock mass under blasting disturbance","authors":"Xudong Jiang ,&nbsp;Yiguo Xue ,&nbsp;Xingtao Ren ,&nbsp;Fanmeng Kong ,&nbsp;Xiaomu Liao","doi":"10.1016/j.ijimpeng.2024.105036","DOIUrl":"https://doi.org/10.1016/j.ijimpeng.2024.105036","url":null,"abstract":"<div><p>The mechanical responses and damage characteristics of fractured rock masses under dynamic loads play a significant role in ensuring the safety of blasting operations. The study employs dynamic finite element method (FEM) to simulate blasting in fractured rock masses, revealing the propagation features of blasting stress waves, the evolution of effective stress and the mechanism of damage evolution around the borehole. Based on the Weibull distribution, a rock damage model was established, which yielded the stress-strain relationship and damage equation for rocks under uniaxial impact. The parameters of the damage equation were fitted through numerical SHPB tests. The results indicate that in the direction of higher initial stress, the stress wave propagates faster, and the development of damage surfaces is more pronounced. In cylindrical charge blasting, the maximum blasting stress occurs in the middle section of the borehole, with limited influence from the charge on the bottom of the hole. Within a range of approximately 2 to 3 times the borehole diameter, the surrounding rock sustains complete damage. While within a range of about 4 to 5 times the borehole diameter, the degree of damage to the surrounding rock decreases rapidly, and beyond this range, the damage to the surrounding rock gradually diminishes.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141429857","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":"Experimental, analytical and numerical study of reinforced concrete beams impacted by deformable bodies at low velocities","authors":"Lucas Márquez ,&nbsp;Hervé Le Sourne ,&nbsp;Philippe Rigo","doi":"10.1016/j.ijimpeng.2024.105027","DOIUrl":"10.1016/j.ijimpeng.2024.105027","url":null,"abstract":"<div><p>In this work, the structural behavior of Reinforced Concrete (RC) beams struck by rigid and deformable impactors at low velocities is studied. An experimental campaign consisting of three-point bending, crushing, and drop-weight tests is carried out to characterize and compare the quasi-static and dynamic behaviors of the colliding bodies. Three repetitions per configuration are tested to obtain reliable data and to check the consistency and repeatability of the proposed experiments. The results are accurately reproduced using Non-Linear Finite Element (NLFE) models to obtain insights regarding the influence of strain rates in the experiments. Furthermore, a simple analytical method that considers the deformability of both bodies through their corresponding force–displacement relationships is presented. The proposed model is observed to predict with a reasonable accuracy the contact force profiles and the deformations of both bodies in almost all of the studied scenarios, while being orders of magnitude faster than the NLFE simulations.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141415972","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}