NONLINEAR FINITE ELEMENT ANALYSIS OF THERMAL STRESSES IN 3D C-C NOSETIP

Nosetip is an axisymmterical structure.Three. Dimensional Carbon-Carbon (3D C-C) is orthotropic,nonlinear material with different moduli in tension and in compression.SAAS III,which is usually used for thermal stress analvs.is of nosetiu made of 3D C-C, was modified in this paper.The modification consists of follow-ing aspects.The tensile or compressive modulus used for complex stress state is determined with the signs of fiber bundle stress instead of the sins of the principal stresses. Nonlinear shear stress-strain relationship is taken into consideration, Integrity check is also included in computation based on strength criterion established in authors' previous paper.Graphic plotting function is also improved. Influence of different weave on thermal stress distribution is also discussed in this paper.