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《Chinese Journal of Rock Mechanics and Engineering》 2007-S1
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INVESTIGATION ON IMPACT RESPONSES FOR ROCK-LIKE BRITTLE MATERIALS

FEI Huiyang,XU Songlin,TANG Zhiping(Key Laboratory for Mechanical Behavior and Design of Materials of Chinese Academy of Sciences,University of Science and Technology of China,Hefei,Anhui 230027,China)  
Investigation of impact responses for rock-like brittle materials nowadays is mainly focused on the experiments of compression impacting.However,the impact-induced damage behaviors of rocks can not be fully revealed only by the compression process for the special properties of rock-like materials.Based on a so-called transversal shear wave tracing technique(SWT) proposed by Professor Z.P.TANG,series of experiments for rock salt and cementitious composites subjected to shear and compression combined impact loadings are conducted.The transversal impact responses are used to reveal the damage property of brittle materials.When the brittle material is in the damage state,the rule of the compression property is not evident for the scattered distribution in material features;howevert,he shear responses take on good tendencyt:he wave velocity and the strength of shear wave decrease evidently with the increase of damage degree in materials.When comparing the shear strength for sample with normal stress to that without normal stress,the latter shows that the strength of shear wave decreases evidently with the increase of damage degree,while the former shows a similar tendency but with great oscillations at local.It can be concluded that the transversal wave,especially the unloading transversal wave,is especially important for the dynamic damage investigation of brittle materials.
【Fund】: 国家自然科学基金资助项目(10672157 10202022)
【CateGory Index】: TU45
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