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航空學院青年學術論壇第156講-英國曼徹斯特大學 李慶明教授
2019-07-03 08:49   審核人:

 

報告人:英國曼徹斯特大學機械宇航土木工程學院  李慶明教授

邀請人:李玉龍教授

間:201978日上午10:30-12:00

點:西北工業大學友誼校區航空樓A706

目:Strain-rate effect on the compressive strength of brittle materials and its implementation into material strength model

要:

This studies the strain-rate effect on the compressive strength of brittle materials and its implementation into a material strength model. It shows that most of the current practices to consider strain-rate effect on the compressive strength of brittle materials using uniaxial stress data and loading path are questionable. It demonstrates that the rapid increase of the dynamic compressive strength between the transition strain-rate and the upper limit strain-rate in a SHPB test is correlated with the change of stress state in SHPB specimen, i.e. the stress state in SHPB specimen is changed from uniaxial stress state toward uniaxial strain state with the continuous increase of strain-rate from the transition strain-rate. Dynamic increase factor (DIF) based on experimental data under uniaxial strain state is recommended for the consideration of strain-rate effect on the compressive strength of brittle materials. An associated method to implement the uniaxial strain DIF into material strength model is also proposed and verified. Discussion on the DIF formulae and their implementations in several popular strength models of concrete-like materials is presented.

李慶明教授簡介:

李慶明教授簡歷,男,19628月出生,博士,教授,博士生導師。2010年被英國利物浦大學授予榮譽工程博士學位(DEng)。英國曼徹斯特大學大學機械宇航土木工程學院教授。主要研究方向為沖擊動力學、侵徹力學、結構耐撞性、輕質材料力學及結構抗沖擊爆炸防護。在國內外重要學術刊物上發表學術論文150余篇,其中被SCI期刊收錄90余篇。目前,擔任《國際沖擊工程》IJIE雜志副主編,《國際防護結構》雜志編委。

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