Determination of brazed joint constitutive law by inverse method

Georges Lovato , F. Moret , P. Le Gallo , Georges Cailletaud (1) , Philippe Pilvin

1 CDM - Centre des Matériaux

An important parameter often neglected for the calculation of residual stresses in brazed ceramic/metal assemblies is the joint constitutive law. In situ camber measurements on a model system (axisymmetric TZM/InCuSil ABA/316L samples) performed using a special vertical dilatometer during the whole brazing thermal cycle are compared with results of FEM calculations based on published filler metal constitutive laws. A strong disagreement is observed. Actual constitutive law of the joint is determined from these measurements using a numerical inverse method. Calculated displacements are fully consistent with experimental ones. True solidification temperature of the joint is determined. The identified constitutive law of the joint exhibits a low flow stress from solidification temperature to 320°C.

Domaines: Articles anciens

Georges Lovato, F. Moret, P. Le Gallo, Georges Cailletaud, Philippe Pilvin. Determination of brazed joint constitutive law by inverse method. Journal de Physique IV Proceedings, 1993, 03 (C7), pp.C7-1135-C7-1140. ⟨10.1051/jp4:19937176⟩. ⟨jpa-00251807⟩