Talk about dynamic strength and damage evolution

Wang Lili; Hu Shisheng; Yang Liming; Dong Xinlong; Wang Hui

doi:10.11883/1001-1455(2017)02-0169-11

Volume 37 Issue 2

Mar. 2017

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Wang Lili, Hu Shisheng, Yang Liming, Dong Xinlong, Wang Hui. Talk about dynamic strength and damage evolution[J]. Explosion And Shock Waves, 2017, 37(2): 169-179. doi: 10.11883/1001-1455(2017)02-0169-11

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Wang Lili, Hu Shisheng, Yang Liming, Dong Xinlong, Wang Hui. Talk about dynamic strength and damage evolution[J]. Explosion And Shock Waves, 2017, 37(2): 169-179. doi: 10.11883/1001-1455(2017)02-0169-11

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Talk about dynamic strength and damage evolution

doi: 10.11883/1001-1455(2017)02-0169-11

1.
MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, Zhejiang, China
2.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China
3.
Wang Hui Workroom, Ningbo Hospital of Traditional Chinese Medicine, Ningbo 315000, Zhejiang, China

Received Date: 2016-12-23
Rev Recd Date: 2017-01-19
Publish Date: 2017-03-25

Abstract

Abstract

The strength of a material is traditionally understood as its ability to resist flow/deformation and breakage (brittle fracture or ductile rupture) under applied load. The breakage, though looking like an abrupt occurrence, actually results from a strain-rate/time dependent process of damage evolution. The difficulty in studying dynamic damage evolution lies in that the damage evolution and the flow/deformation process are coupled and influence each other. It was found that the dynamic evolution of macro-damage could be successfully described by the thermo-activated damage evolution model. Based on this model, the damage evolution and the flow/deformation can be decoupled from the experimentally measured apparent stress-strain curve with damage evolution, and the related material parameters can be determined. Such an approach is then generalized to the objective study of the TCM pulse. The normal and pathological constitutive relations of the pulse wave system can be inversely determined by pulse wave signals, and then the degree of deviation from the normal condition (illness state) of patients can be diagnosed, and their illness state can be regarded as a kind of generalized damage. The same approach is further generalized to the study of earthquake prediction through the 'pulse-taking for the earth'. Combined with the load-unload response ratio theory, by measuring the seismic wave signals on three adjacent positions, the nonlinear constitutive load-response curve with damage evolution can be inversely determined for the tectonic plates of the earth concerned, then the degree of the damage can be finally discriminated, which is the key information for an improved earthquake prediction.
- dynamic strength,
- damage evolution,
- dynamics of materials,
- pulse wave,
- earthquake prediction

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References(31)

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