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Explicit FE wrinkling simulation and method to catch critical bifurcation point in tube bending process YANG He(杨 合), LI Heng(李 恒), ZHAN Mei(詹 梅), GU Rui-jie(谷瑞杰) Department of Materials Forming... on the reliable FE model. Then a two step strategy is proposed to capture the critical bifurcation point for the optimal design process. The results show: 1) The boundary conditions determine the tube......
. The critical safety thickness of the roof (floor) of underground chambers has been confirmed according to the destabilization condition. The influence of amplitude and frequency of blasting vibration load on the critical safety thickness has been analyzed, and the quantitative relation between velocity, frequency of blasting vibration and critical safety thickness has been determined. Research......
) where a0 is the initial crack length, ac is the critical effective crack length, D is the depth of the beam, and D0 is the thickness of clip gauge holder. Fig.3 Mechanism of FBG sensors Fig.4...J. Cent. South Univ. Technol. (2011) 18: 1693-1699 DOI: 10.1007/s11771-011-0890-4 Critical crack tip opening displacement of different strength concrete WANG Bing(王冰)1, 2, ZHANG Xiu-fang(张秀芳)1......
of rock plug with the variation of different parameters is also discussed. 4.1 Effects of parameters ζ and m on safe thickness of rock plug ζ and m are the critical parameters that their values directly...J. Cent. South Univ. (2017) 24: 2940-2950 DOI: https://doi.org/10.1007/s11771-017-3708-1 Energy analysis of rock plug thickness in karst tunnels based on non-associated flow rule and nonlinear......
may occur was introduced by Royer, which motivated Franck and Merwe[3] to introduce the relevant concepts of misfit strain, misfit dislocations, critical misfit and critical thickness. The critical misfit fc is homogeneously strained into registry with the substrate, and the critical thickness is the critical layer thickness above which an interface of given natural misfit loses registry......
; 文章编号:1672-7207(2011)07-2109-06 A method for predicting critical accumulative thickness of sulfide concentrate spontaneous combustion in storage YANG Fu-qiang1, 2, WU Chao1, 2 (1. School... 410083, China) Abstract: The concept of critical accumulative thickness of sulfide concentrate spontaneous combustion in storage was put forward, and a wire-mesh basket crossing point temperature method......
. The expressions of critical safety thickness were derived with necessary and sufficient conditions. The method was applied to the practical engineering. Some parameters related to the stability were.... The mechanical models are established based on different situations and prediction formulas are deduced for calculating the critical safety floor thickness. 2.1 Mechanical model and reasonable hypothesis MO......
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loads and the first buckling modes with those obtained through theoretical analysis. Two typical initial defects, non-circularity and uneven thickness distribution, were studied. Critical loads decline... cylindrical shell is under torsion. Unfortunately, it has a completely different buckling mode when cylindrical shell is under axial compression. Critical loads decline with the increase of thickness defect......
