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排序方式: 共有54条查询结果,搜索用时 15 毫秒
1.
提出了平面弹性介质中主裂纹与微裂纹相互作用问题的有效数值计算
方法. 通过把适于单一裂纹的Bueckner原理扩充到含有多裂纹的一般体系,将原问题分解
为承受远处载荷不含裂纹的均匀问题,和在远处不承受载荷但在裂纹面上承受面力的多裂纹
问题. 于是,以应力强度因子作为参量的问题可以通过考虑后者(多裂纹问题)来解决,而
利用提出的杂交位移不连续法,这种多裂纹问题是容易数值求解的. 列举
Cai和 Faber为评价主裂纹与微裂纹相互作用问题的近似方法而列举的算例,说明
该数值方法对分析平面弹性介质中主裂纹与微裂纹相互作用问题既简单又非常有效. 相似文献
2.
3.
In the present paper, the effective elastic moduli of an inhomogeneous medium with cracks are derived and obtained by taking
into account its microstructural properties which involve the shape, size and distribution of cracks and the interaction between
cracks. Numerical results for the periodic microstructure of different dimensions are presented. From the results obtained,
it can be found that the distribution of cracks has a significant effect on the effective elastic moduli of the material.
The project supported by the National Education Committee for Doctor 相似文献
4.
5.
P. Hutar Z. Majer L. Nahlik L. Shestakova Z. Knesl 《Mechanics of Composite Materials》2009,45(3):281-286
The main focus of this paper is a numerical investigation of the fracture behavior of a particulate composite (CaCO3-PP). The composite is modeled as a three-phase continuum and simulated numerically on a microscale by using finite elements.
The propagation of a microcrack in a matrix filled with rigid particles covered by an interphase is analyzed. The stress distribution
is determined for a variety of particle sizes and material properties of the interphase. The final results, in agreement with
experimental data, confirm that the microcrack behavior depends on particle sizes.
Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 45, No. 3, pp. 411-418, May-June, 2009. 相似文献
6.
SIH G.C. 《中国科学:物理学 力学 天文学(英文版)》2014,57(1):51-58
When two contacting solid surfaces are tightly closed and invisible to the naked eye,the discontinuity is said to be microscopic regardless of whether its length is short or long.By this definition,it is not sufficient to distinguish the difference between a micro-and macro-crack by using the length parameter.Microcracks in high strength metal alloys have been known to be several centimeters or longer.Considered in this work is a dual scale fatigue crack growth model where the main crack can be micro or macro but there prevails an inherent microscopic tip region that is damaged depending on the irregularities of the microstructure.This region is referred to as the"micro-tip"and can be simulated by a sharp wedge with different angles in addition to mixed boundary conditions.The combination is sufficient to model microscopic entities in the form of voids,inclusions,precipitations,interfaces,in addition to subgrain imperfections,or cluster of dislocations.This is accomplished by using the method of"singularity representation"such that closed form asymptotic solutions can be obtained for the development of fatigue crack growth rate relations with three parameters.They include:(1)the crack surface tightness*represented by o/=0.3-0.5 for short cracks in region I,and 0.1-0.2 for long cracks in region II,(2)the micro/macro material properties reflected by the shear modulus ratio*(=micro/macro varying between 2 and 5)and(3)the most sensitive parameter d*being the micro-tip characteristic length d*(=d/do)whose magnitude decreases in the direction of region I II.The existing fatigue crack growth data for 2024-T3 and 7075-T6 aluminum sheets are used to reinterpret the two-parameter da/dN=C(K)nrelation where K has now been re-derived for a microcrack with surfaces tightly in contact.The contact force will depend on the mean stress m or mean stress ratio R as the primary parameter and on the stress amplitude a as the secondary parameter. 相似文献
7.
Li Wenfang South China University of Technology Guangzhou R. R. ChinaDu Shanyi Harbin Institute of Technology Harbin 《Acta Mechanica Solida Sinica》1995,8(1):75-83
The modified equivalent inclusion theory by the authors and the internalvariable theory are employed to investigate the evolution of the microcracks in whiskertoughening ceramics and the influence of the microcracks on the mechanical propertiesof the material. The effect of residual thermostrain, whisker content and aspect ratio isconsidered. The modulus, initial nonlinear load, strength and nonlinear constitutiverelation are calculated and some important conclusions are given. 相似文献
8.
微裂纹扩展中的分形现象及其计算机仿真 总被引:1,自引:0,他引:1
本文探讨了采用仿真技术研究微裂纹连接过程和生成分形断口表面的可行性,发展了用于仿真微裂纹随机生长行为的GO模型的基本构相,并进行了计算机仿真实验,由此得出了一此有的结论。 相似文献
9.
Al/SiCp复合材料微裂纹产生的原位研究 总被引:1,自引:0,他引:1
本文用扫描电镜下的单面缺口拉伸试验,考察了Al/SiCp试样的空穴的生成,裂纹的扩展以及裂纹前端微断裂区,指出该材料变脆的原因是由于微断裂区中的一次空穴所造成的。 相似文献
10.