不同应力状态下Ti-Al层状复合板各向异性行为研究

Study on anisotropic behavior of Ti-Al laminated clad plate under different stress states

为了探究不同应力状态下Ti-Al层状复合板力学性能各向异性的变化规律,通过0°、45°和90°方向复合板的单向拉伸实验研究了处于单向应力状态的未打孔复合板及平面应力状态的打孔复合板的力学性能随复合板角度的变化规律。发现未打孔复合板的断后伸长率及抗拉强度沿不同方向具有明显差异,表现为随复合板角度的增大而减小。而当引入圆孔缺陷后,沿不同方向复合板的断后伸长率及抗拉强度差异化程度显著下降。对断口形貌进行观察,发现未打孔Ti-Al层状复合板沿不同方向的钛层、铝层及结合层的断裂形貌差异较大,而打孔后的复合板沿不同方向的断裂形貌基本一致。结果表明,平面应力状态下Ti-Al层状复合板的力学性能各向异性较单向应力状态显著弱化。

To explore the variation law of anisotropy of mechanical properties of Ti-Al laminated clad plate under different stress states,the mechanical property variation laws of unpunched clad plate under uniaxial stress state and punched clad plate under biaxial stress state were studied by uniaxial tensile tests along 0°,45°and 90°directions.It is found that the elongation after fracture and the tensile strength of unpunched clad plate along different directions are significantly different,and show a decrease with the increase of the clad plate angle.After the introduction of round hole defects,the differentiation degree of the elongation after fracture and tensile strength of the clad plate along different directions is significantly reduced.The fracture morphology was observed,and it is found that the fracture morphology difference of the Ti layer,Al layer and bonding layer of the unpunched Ti-Al laminated clad plate along different directions is large,and the fracture morphology of the punched clad plate along different directions is basically consistent.The results show that the anisotropy of the mechanical properties of Ti-Al laminated clad plate under biaxial stress state is significantly weaker than that under uniaxial stress state.