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用二次曝光全息干涉法,对有机玻璃材料试件,用小载荷静力加载方式,对单向拉伸单边裂纹有限宽板进行了试验研究,获得了裂纹尖端近区全场应力分布全息图。 单边裂纹有限宽板承受单向拉伸载荷时,近裂纹端的弹性应力场的理论解和光测弹性力学主应力和与等厚干涉条纹级数之间的关系式,当θ=0时,可以推导出关系式n/n_∞=F(2a/r)~(1/2)。因为a、r已知,n、n_∞可由试验测定,从而可以确定F。再由公式K_1=Fσ(πa)~(1/2)即可得到Ⅰ型应力强度因子K_1。
By means of double-exposure holographic interferometry, the uniaxially-stretched unilateral cracked finite-width plate was tested on the specimen of plexiglass by static load with small load. The full-field stress distribution holographic near the crack tip Figure The theoretical solution of the elastic stress field near the crack tip and the relationship between the principal stress of the optical elasticity and the number of the interference fringes of the same thickness when the unilateral crack has a finite width under uniaxial tensile loading can be obtained when θ = 0 The relation n / n_∞ = F (2a / r) ~ (1/2) is deduced. Since a, r are known, n, n_∞ can be determined experimentally, so that F can be determined. Then by the formula K_1 = Fσ (πa) ~ (1/2) can be Ⅰ type stress intensity factor K_1.