A method to determine fracture toughness using Berkovich indenter for bulk materials
An indentation approach with Berkovich indenter is proposed to determine fracture toughness for ductile materials.With decrease of effective elastic modulus,an approximate linear relationship between logarithmic plastic penetration depth and logarithmic effective elastic modulus,and a quadratic polynomial relationship between the plastic penetration depths and penetration loads are exhibited by indentation investigation with Berkovich indenter.The damage constructive equation of effective elastic modulus is proposed to determine the critical effective elastic modulus at the fracture point,which is the key problem to calculate the indentation energy to fracture.The critical plastic penetration depth is identified after the critical effective elastic modulus can be predicted by conventional mechanical properties.The fracture toughness is calculated according to the equation of penetration load,plastic penetration depth and the critical plastic penetration depth.
Berkovich indenter indentation fracture technique ductile materials damage mechanics
Min He Duanhu Shi Feng Yang Ning Zhang Huafeng Guo
Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control,Xuzhou Institute of Tech Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control,Xuzhou Institute of Tech
国际会议
武汉
英文
456-460
2013-06-15（万方平台首次上网日期，不代表论文的发表时间）