Statistical Approach to determine Continuum Damage Weibull Parameters in Laminated Composites
Internal state variable approaches in the progressive failure analysis(PFA),such as continuum-damage-mechanics(CDM)models,regard the material as a continuum having smooth,continuous field equations.Matzenmiller-Lubliner-Taylor(MLT)formulation is based on the use of the Weibull function to describe the statistical nature of internal defects and the ultimate strength of a fiber bundle within a composite lamina.Generally,Weibull parameter is one of the control parameters that affect the strain-energy density at a given material location.In this paper,Weibull parameter was extended to three parameters to satisfy multi-scale compatibility.Those three Weibull parameters,which have roles as coefficients for damage evolution function,were investigated by a statistical model for progressive tensile fibre failure in the composite laminate.A certain PFA prodecure was developed and added to the existing Internet Parallel Structural Analysis Program(IPSAP)to predict strength of the laminates.Newton-Raphson method was involved to adopt damage estimation in the PFA procedure.Continuum damage analysis based on MLT model was revised to add statistical characteristic of the material strength.Three Weibull parameters were constrained to satisfy compatibility between the meso-and macro-scale material strength.All the parameters including lamina properties and Weibull parameters can be predicted by experimental examination for the longitudinal/transverse tensile strength and in-plane shear strength of a lamina.It was also used to compare with the stress concentration coupon test.This approach shows not only that the sizing effects of a laminate can be expected for a longitudinal tensile experiment,but also that post failure behavior in the stress concentration coupon properties can be obtained exactly,if the parameters were induced by the statistical or experimental results.
Progressive Failure Analysis Composite Strength Laminate
Kook-jin Park Hee-jin Kang SangJoon Shin Ik-hyun Choi MinKi Kim Seung-jo Kim
Department of Mechanical & Aerospace Engineering,Seoul National University,1 Gwanak-ro,Gwanak-gu,Seo Korea Aerospace Research Institute,169-84 Gwahak-ro,Yuseong-gu,Daejeon,305-806,Rep.of KOREA
国际会议
2014 Asia-Pacific International Symposium on Aerospace Technology(2014亚太航空航天技术学术会议)
上海
英文
1-5
2014-09-24（万方平台首次上网日期，不代表论文的发表时间）