チモチェンコはり理論に基づく弾性および粘弾性三点曲げ試験片の動的破壊力学パラメータの簡便評価式

概要

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Simple formulas for the dynamic fracture mechanics parameters. of a three-point elastic or viscoelastic bend specimen are derived by means of the Timoshenko's beam theory. Numerical analysis is performed for a specimen of steel or PMMA impacted by a falling steel cylinder or sphere. The contact force between the specimen and impactor is estimated by applying the Hertz's theory to the local deformation near the contact point, and the fracture mechanics parameters are evaluated by the simple formulas. For the purpose of comparison, computations are also performed by using the formula which has been obtained previously using the Euler-Bernoulli's beam theory. A fracture test of PMMA beam was conducted and the dynamic strain intensity factor was measured by a strain gauge mounted near the crack-tip. It is found that the fracture mechanics parameters are overestimated if the effects of rotary inertia and transverse-shear deformation of specimen are neglected.
1984-05-25