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Measurement of dynamic fracture toughness and failure behavior for explosive mock materials
Pengwan CHEN, Zhongbin ZHOU, Shaopeng MA, Qinwei MA, Fenglei HUANG
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 292-295 doi: 10.1007/s11465-011-0237-8
In this work, a pre-cracked semi-circular shaped explosive simulant was loaded using a split Hopkinson pressure bar (SHPB). A high-speed camera was used to capture the deformation and fracture process of the specimen in situ. The digital images were processed using the digital image correlation (DIC) method. Next, full displacement and strain fields were obtained. The displacement vector field shows that the specimen fractured under tensile stress action. The strain field can be used to predict the crack propagation. Results show that the method of combined DIC and SHPB is effective to study the dynamic deformation and fracture behavior of explosive simulants. In addition, the specimen was loaded using a drop weight. The fracture toughness of the specimen was preliminary measured.
关键词: digital image correlation polymer bonded explosive simulant split Hopkinson pressure bar (SHPB) semicircular bending test deformation fracture toughness
A toughness based deformation limit for X- and K-joints under brace axial tension
Bo GU,Xudong QIAN,Aziz AHMED
《结构与土木工程前沿(英文)》 2016年 第10卷 第3期 页码 345-362 doi: 10.1007/s11709-016-0333-2
关键词: circular hollow section (CHS) tubular joint fracture failure deformation limit J-integral
张宝,丁淳彤,刘宝华,陈雪莲
《中国工程科学》 2003年 第5卷 第3期 页码 44-50
利用飞轮式Hopkinson拉杆实验技术对钨质量分数为93% 的钨合金在-50~100℃温度范围、应变率ε=102~103s-1区间的动态拉伸性态进行了测试,提供了相应的σ-ε曲线和最大拉伸失效应变,并以此为依据建立了该合金动态拉伸行为的本构关系,提出了该合金受动载发生塑性失稳以致发生拉断的判据。利用断口分形分析理论,对试件拉伸断口微观特征所作的分析和对宏观力学性态实验所作的结论给予了有力的支持。
时君友,徐文彪,王淑敏
《中国工程科学》 2014年 第16卷 第4期 页码 40-44
以淀粉基水性高分子异氰酸酯(API)胶合木胶接结构为研究对象,以胶接的压缩剪切强度为评估指标,通过加速湿热老化试验对胶接结构的破坏模式和失效机理进行了研究。结果表明:胶接结构的断裂性质为韧性断裂,且随着老化时间的增加,其破坏模式为由内聚破坏向内聚破坏+界面破坏转变。在湿热老化试验前期温度对压缩剪切试样性能起主要作用,在老化后期湿度起主要作用。
Integrated management of cardiac failure: the cardiac failure clinic
null
《医学前沿(英文)》 2011年 第5卷 第1期 页码 20-25 doi: 10.1007/s11684-011-0106-1
The prevalence of the risk factors and the risk of cardiac failure are both increasing in China. This might be the consequence of the changes of the life conditions (emigration to the urban areas, changes in the diet and life style, lack of physical exercise, etc.). The wide range of clinical presentations of cardiac failure (acute or chronic) and of therapeutic approaches (medical or surgical) makes necessary the integration within the same structure of the various experts involved in the diagnosis and the treatment of cardiac diseases. Technologic and human resources required to offer all the options represent a multifaceted commitment which should be focused optimally in dedicated centers. In these centers, collaboration should replace competition between the medical and the surgical cardiac specialists. Development of team work should permit to optimize the cost efficacy of the treatments. Most of all, such a structure will facilitate the translation of innovative therapies between the research centers and clinical facilities.
关键词: cardiac failure cardiac transplantation mechanical circulatory support
Tests on impact effect of partial fracture at steel frame connections
CHEN Yiyi, BIAN Ruoning
《结构与土木工程前沿(英文)》 2008年 第2卷 第4期 页码 295-301 doi: 10.1007/s11709-008-0049-z
关键词: structural fracture natural fracture progressive high-frequency
Effect of fly ash replacement level on the fracture behavior of concrete
Mahdi AREZOUMANDI, Jeffery S. VOLZ
《结构与土木工程前沿(英文)》 2013年 第7卷 第4期 页码 411-418 doi: 10.1007/s11709-013-0228-4
Computational modeling of fracture in concrete: A review
Luthfi Muhammad Mauludin, Chahmi Oucif
《结构与土木工程前沿(英文)》 2020年 第14卷 第3期 页码 586-598 doi: 10.1007/s11709-020-0573-z
关键词: concrete fracture macroscopic micromechanical heterogeneity
Computational modeling of fracture in capsule-based self-healing concrete: A 3D study
《结构与土木工程前沿(英文)》 2021年 第15卷 第6期 页码 1337-1346 doi: 10.1007/s11709-021-0781-1
关键词: 3D fracture self-healing concrete spherical cohesive elements heterogeneous
Evaluating the material strength from fracture angle under uniaxial loading
Jitang FAN
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 288-293 doi: 10.1007/s11709-018-0480-8
A dimensional analysis on asphalt binder fracture and fatigue cracking
Qian ZHAO, Zhoujing YE
《结构与土木工程前沿(英文)》 2018年 第12卷 第2期 页码 201-206 doi: 10.1007/s11709-017-0402-1
Progressive failure analysis of notched composite plate by utilizing macro mechanics approach
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 623-642 doi: 10.1007/s11709-021-0726-8
关键词: progressive failure notched composite plate Hashin failure criterion macro mechanics approach finite element method
Experimental research on ductile fracture criterion in metal forming
Song YU, Weiming FENG
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 308-311 doi: 10.1007/s11465-011-0233-z
Ductile fracture criterion is key limitation parameter in material forming. Accuracy predicting surface and internal failure in plastic deformation process affects on the technology design of workpiece and die greatly. Tension, compression, torsion and shearing test on 45# steel are utilized for providing the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion are selected to simulate the physical experiments and their relative accuracy for predicting and quantifying fracture initiation sites are investigated. The comparing results show that metal forming process under high triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture criteria, but the Ayada and general Rice-Tracey model work very well for the low triaxiality cases.
关键词: ductile fracture criteria metal forming process material experiment stress triaxiality
《医学前沿(英文)》 2022年 第16卷 第3期 页码 496-506 doi: 10.1007/s11684-021-0828-7
A concise review about fracture assessments of brittle solids with V-notches
Hsien-Yang YEH, Bin YANG
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 478-485 doi: 10.1007/s11709-019-0520-z
A concise review of recent studies about the fracture assessments of elastic brittle solid materials containing V-notches is presented. In this preliminary and brief survey, elastic stress distributions in V-notched solids are discussed first. The concept of notch stress intensity factor is introduced. Combine the digital image correlation method with numerical computation techniques to analyze the stress distribution near the notches. Fracture criteria such as strain energy density, J-integral, theory of critical distance are used.
标题 作者 时间 类型 操作
Measurement of dynamic fracture toughness and failure behavior for explosive mock materials
Pengwan CHEN, Zhongbin ZHOU, Shaopeng MA, Qinwei MA, Fenglei HUANG
期刊论文
A toughness based deformation limit for X- and K-joints under brace axial tension
Bo GU,Xudong QIAN,Aziz AHMED
期刊论文
Effect of fly ash replacement level on the fracture behavior of concrete
Mahdi AREZOUMANDI, Jeffery S. VOLZ
期刊论文
Computational modeling of fracture in concrete: A review
Luthfi Muhammad Mauludin, Chahmi Oucif
期刊论文
Hybrid deep learning model for risk prediction of fracture in patients with diabetes and osteoporosis
期刊论文