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裂纹尖端张开位移(Crack Tip Opening Displacement,缩写成C.T.O.D.。在不引起混淆的场合写成C.O.D.有时简写成δ)就是材料受载后裂纹尖端的弹塑性张开量,它是描述裂纹尖端应力应变场的一
The Crack Tip Opening Displacement (abbreviated as C.T.O.D. written as C.O.D., sometimes abbreviated as δ) where no confusion arises, is the elasto-plastic opening of the crack tip after loading of the material, which is the one describing the stress-strain field of the crack tip