DETERMINATION OF LOCAL FRACTURE DATA IN BRITTLE MATERIALS USING STRAIN MAPPING AND INVERSE METHODS
(0) In modeling fracture of brittle materials such as engineering ceramics, the material properties (up to the point of fracture) are often simplified as linear elastic, isotropic and homogeneous. This simplification will not be appropriate if the material under consideration is highly nonlinear, anisotropic,and inhomogeneous. For more complete material characterization, the assumptions made on the material properties should be more general. Using the technique of strain mapping, a simple FE-based inverse method has been designed to characterize the properties of isotropic but heterogeneous material under load. Using the commercial finite element code ABAQUS, this method has been implemented via its User Material Subroutine (UMAT) to allow the material constants to be determined easily. Verification of this method has been carried out using simulated examples and the results showed rapid convergence with good accuracy. The method has also been applied to actual mechanical testing of graphite, for which the local stress-strain behaviors have been derived. The results will provide useful information for the development of fracture models which take into account the heterogeneity of material properties.
material characterization inverse problems elastic constants finite elements fracture
Lianshan Lin Haiyan Li Alex S.L.Fok
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester PO Box 88, Sackville Street, Manchester, UK.M60 1QD
国际会议
昆明
英文
210-215
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）