Strain rate effect on the mechanical properties of a glass fibre reinforced acrylic matrix laminate. An experimental approach

Introducing research progress of rate-dependent tests by domestic and foreign scholars, strain-rate effect on dynamic mechanical properties of concrete are reviewed. Classified descriptions of research results on dynamic load tests of concrete at home and abroad are provided, including uniaxial compression tests, uniaxial tensile tests, and multi-axis tests; strain-rate effects on concrete strength and deformation properties in each test are respectively discussed; and strain-rate effect on concrete energy absorption capability are described.

Download Full-text

Mechanical properties and strain-rate effect of EVA/PMMA in situ polymerization blends

European Polymer Journal ◽

10.1016/j.eurpolymj.2003.11.022 ◽

2004 ◽

Vol 40 (6) ◽

pp. 1239-1248 ◽

Cited By ~ 32

Author(s):

Shih-Kai Cheng ◽

Chuh-Yung Chen

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

In Situ Polymerization ◽

Strain Rate Effect ◽

Rate Effect

Download Full-text

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Journal of Science and Technology in Civil Engineering (STCE) - NUCE ◽

10.31814/stce.nuce2019-13(3)-10 ◽

2019 ◽

Vol 13 (3) ◽

pp. 104-112

Author(s):

Pham Thai Hoan ◽

Nguyen Ngoc Vinh ◽

Nguyen Thi Thanh Tung

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

Strain Rate ◽

Structural Steel ◽

Weld Zone ◽

Strain Rate Effect ◽

Rate Effect ◽

Steel Weld ◽

Instrumented Indentation ◽

Indentation Tests

In this study, instrumented indentation testing was conducted at room temperature for the investigation of the effect of strain rate on the hardness and yield strength in the weld zone of a commonly used structural steel, SM520. A number of indentation tests were undertaken at a number of strain rate values from 0.02 s-1 to 0.2 s-1 in the weld metal (WM), heat-affected zone (HAZ), and base metal (BM) regions of the weld zone. The mechanical properties including yield strength (σy) and hardness (H) in WM, HAZ, and BM were then computed from the applied load-penetration depth curves using a proposed method. As the result, the effects of strain rate indentation on yield strength and hardness in all regions of the weld zone were evaluated. The results displayed that hardness and yield strength in the weld zone’s components are influenced on the strain rate, where both hardness and yield strength decrease with the decreasing strain rate. Keywords: indentation; mechanical properties; strain rate effect; structural steel; weld zone.

Download Full-text

Evolution of penetration mechanism induced by strain rate effect

EPJ Web of Conferences ◽

10.1051/epjconf/201818301063 ◽

2018 ◽

Vol 183 ◽

pp. 01063

Author(s):

Gan Li ◽

Chunming Song ◽

Mingyang Wang

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

Great Influence ◽

Dynamic Mechanical Properties ◽

Strain Rate Effect ◽

Rate Effect ◽

Spatial Inhomogeneity ◽

Dynamic Mechanical ◽

Penetration Effect ◽

Penetration Mechanism

According to the dynamic mechanical properties, in the striking velocity range, the strain rate of the projectile and target caused by penetration can reach 104~106 /s. The strain rate effect increases sharply and then tends to saturation. During the penetration process, the mechanical properties of the target and the projectile change violently and present serious spatial inhomogeneity, which has a great influence on the penetration effect. In this paper, penetration experiments of granite targets by steel projectiles are carried out in the range of 1200m/s~2400m/s, the crater parameters are measured and the projectiles are recovered to obtain the macroscopic failure pattern of the projectiles and the targets. Based on the dynamic mechanical properties, an interaction model of the projectiles and the target is established, which considers the spatial and temporal distributions of the strain rates during penetration. With this model, the influences of material mechanical behaviour on penetration effect at different velocities are analysed, the formation cause and internal mechanism of penetration effect are discussed, and the influence mechanism of the strain rate effect on the penetration mechanism evolution is also revealed.

Download Full-text

Strain rate effect on dynamic mechanical properties and microstructure of cemented tailings composites

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.118537 ◽

2020 ◽

Vol 247 ◽

pp. 118537 ◽

Cited By ~ 5

Author(s):

Shuai Cao ◽

Gaili Xue ◽

Weidong Song ◽

Qing Teng

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

Dynamic Mechanical Properties ◽

Strain Rate Effect ◽

Rate Effect ◽

Dynamic Mechanical

Download Full-text

Strain Rate Effect on Mechanical Properties of the 3D-Printed Metamaterial Foams With Tunable Negative Poisson’s Ratio

Frontiers in Materials ◽

10.3389/fmats.2021.712500 ◽

2021 ◽

Vol 8 ◽

Author(s):

Di Gao ◽

Bin Wang ◽

Haoqiang Gao ◽

Fuguang Ren ◽

Chunxia Guo ◽

...

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

Biomedical Engineering ◽

Poisson’S Ratio ◽

Strain Rate Effect ◽

Rate Effect ◽

Poisson's Ratio ◽

Negative Poisson’S Ratio ◽

Negative Poisson's Ratio ◽

Deformation Patterns

As a kind of metamaterial, the negative Poisson’s ratio foams, which expand (shrink) in the transverse direction when stretched (compressed) in the longitudinal direction, have many potential applications in fields such as aerospace and mechanical and biomedical engineering. In this paper, the out-of-plane crushing behaviors of four types of the orthogonal isotropic NPR convex-concave foams (CCF) were extensively studied using an electronic universal testing machine and Instron machine at different strain rates where each test was conducted at a constant compressive velocity under uniaxial compression. Strain rate effect on mechanical properties of these foams is experimentally studied. When the strain rate increases, the compressive force enhancement of the foams is obvious and varies with different specimens. The difference in energy absorption and deformation patterns for these foams between quasi-static and dynamic loading conditions is also analyzed. We find that the deformation patterns for the specimens are not only related to the compressive velocities but also the topologies of the specimens. The research in this paper is expected to be meaningful for the optimization design of the foam structures/materials widely used in the fields of aerospace and mechanical and biomedical engineering.

Download Full-text