主催: 一般社団法人 日本機械学会
会議名: M&M2018 材料力学カンファレンス
開催日: 2018/12/22 - 2018/12/24
A method for predicting fracture toughness of a given laminate of any stacking sequence on the basis of the fracture toughness values of the constituent unidirectional plies is proposed. The laminate toughness prediction method is combined with a finite fracture mechanics (FFM) model to predict the notched strengths of two kinds of quasi-isotropic laminates. Static tension tests are first carried out on specimens with a circular open hole for four different values of hole-diameter to specimen-width ratios, respectively. The quasi-isotropic laminates of different stacking sequences exhibited similar notch sensitivity. Slightly smaller values of notched strength were predicted using the FFM model predicted with the ply-based laminate fracture toughness prediction method, regardless of notch size.