排序方式: 共有42条查询结果,搜索用时 15 毫秒
21.
A FEM analysis for studying mixed-mode fracture problem of chopped strand mat glass fibre reinforced polyester laminate is presented. The analysis is formulated on the basis of 8-node quadrilateral isoparametric element. The collapsed triangular quarter-point singular elements were used for calculating stress intensity factors KΙ and KⅡ.The crack propagation process was computed by implementing constraint release technique. Three different approaches to the solution of stress intensity factors KΙ and KⅡ were compared. The effect of constraint condition imposed upon the displacement of the three collapsed nodes of the crack tip elements on the KΙ and KⅡ results was evaluated. The mixed-mode critical stress intensity factors KΙC and KⅡC were estimated for CSM-GRP through the consideration of KΙ and KⅡ calculated and the measured failure load and critical crack length in the experiment. 相似文献
22.
23.
24.
1.引言由几块平板组成的空间结构在工程上得到广泛应用.其动力、静力问题是很难用经典材料力学和弹性力学方法解决的.有限元方法是解决这类问题的强有力手段.各国力学工作者已经发展了很多解决板壳问题的有限元素法,Zienkiewicz 等提出的位移法有限元公式是最常用的,这个元素的位移函数在边界上一阶法向导数不连续是它的最大缺点,另外一些人提出的位移法边界协调元素公式太复杂,而不为人们所 相似文献
25.
26.
FEM ANALYSIS ON MIXED-MODE FRACTURE OF CSM-GRP 总被引:3,自引:0,他引:3
A FEM analysis for studying mixed-mode fracture problem of chopped strand matglass fibre reinforced polyester laminate is presented.The analysis is formulated on thebasis of8-node quadrilateral isoparametric element.The collapsed triangular quarter-pointsingular elements were used for calculating stress intensity factors K_I and K_(II).The crack propagation process was computed by implementing constraintrelease technique.Three different approaches to the solution of stress intensityfactors K_I and K_(II) were compared The effect of constraint condition imposedupon the displacement of the three collaped nodes of the crack tip elements on theK_I and K_(II) results was evaluated The mixed-mode critical stress intensity factorsK_(IC) and K_(IIC) were estimated for CSM-GRP through the consideration of K_I andK_(II)calculated and the measured failure load and critical crack length in theexperiment. 相似文献
27.
28.
第2届全国复合材料会议于1982年8月18—22日在哈尔滨举行,会议由中国航空学会、中国力学学会和中国宇航学会共同发起和主办,由哈尔滨工业大学和哈尔滨力学学会承担具体会务工作.全国97个单位的256名代表参加,交流论文230余篇。整个 相似文献
29.
30.
对纤维增强复合材料的裂纹起裂及开裂方向准则进行了研究,提出了复合型断裂的正应力强度因子比准则(Normal Stress Intensity Factor Raito Criterion).此准则是一种综合考虑了正应力强度因子和剪应力强度因子对裂纹起裂的推动的准则,并且不需要预先确定材料的特征尺度,使用较方便,且预测结果是很好的。 相似文献