TRANSVERSE AND CYCLIC THERMAL LOADING OF THE FIBER-REINFORCED METAL-MATRIX COMPOSITE SCS6 TI-15-3
TRANSVERSE AND CYCLIC THERMAL LOADING OF THE FIBER-REINFORCED METAL-MATRIX COMPOSITE SCS6 TI-15-3
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DOI：
10.1016/0956-7151(94)90178-3
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发表时间：
1994-12-01
期刊：
影响因子：
--
通讯作者：
LECKIE, FA
中科院分区：
文献类型：
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作者：
JANSSON, S;DALBELLO, DJ;LECKIE, FA
研究了SiC纤维增强钛合金基复合材料在横向机械载荷和循环热载荷作用下的横向力学性能。纤维和基质的热膨胀系数不匹配，除了机械载荷引起的热应力外，还会引起热应力。当工作温度发生波动时，热应力会发生变化，这可能导致塑性应变的增量累积或蠕变速率的增加。所考虑的复合材料具有适度的失配，并且发现应变累积是由在热循环的高温部分的基体中的蠕变变形引起的。在低横向载荷变形的早期阶段，界面处于压缩接触，并且蠕变速率被循环热应力加速。发生脱粘后，循环热应力分量减小，蠕变速率由带孔基体给出。
The transverse properties of a SiC fiber reinforced Ti alloy matrix composite subjected to transverse mechanical and cyclic thermal loading have been investigated. Fibers and matrix have a mismatch in the coefficients of thermal expansion that induces thermal stresses in addition to those caused by mechanical loading. When fluctuations occur in the operating temperature the thermal stresses change and this could cause an incremental accumulation of plastic strain or increase in creep rate. The composite under consideration has a modest mismatch and it was found that the strain accumulation is caused by creep deformation in the matrix at the high temperature portion of the thermal cycles. In the early stages of the deformation for low transverse loading the interface is in compressive contact and the creep rate is accelerated by the cyclic thermal stresses. After debonding has occurred the cyclic thermal stress component is diminished and the creep rate is given by a matrix with holes.