Engineering the resistance to sliding-contact damage through controlled gradients in elastic properties at contact surfaces
Engineering the resistance to sliding-contact damage through controlled gradients in elastic properties at contact surfaces
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DOI：
10.1016/s1359-6454(99)00205-0
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发表时间：
1999-10-26
期刊：
影响因子：
9.4
通讯作者：
Jitcharoen, J
中科院分区：
文献类型：
--
作者：
Suresh, S;Olsson, M;Jitcharoen, J
实验和计算结果表明，仅控制弹性模量的梯度就可以显着增强表面对摩擦滑动接触的抵抗力。用于演示这一新概念的模型材料是渗透有铝硅酸盐玻璃的多晶氧化铝。在该系统中，弹性模量从接触表面到表面以下约2毫米的深度连续增加50%，并且基本上没有长程残余应力。由于弹性模量梯度，接触表面的强度和局部断裂韧性显着恶化。然而，弹性模量的分级本身就将由摩擦滑动接触引入的主拉伸应力降低到这样的程度，即玻璃渗透的氧化铝比单片氧化铝或具有与接触表面的成分相同的均匀成分的玻璃或氧化铝-玻璃复合材料更能抵抗接触损坏。还解决了与均质和梯度材料的滑动接触阻力有关的各种力学和材料问题。 (C) 1999 Acta Metallurgica Inc. 由 Elsevier Science Ltd 出版。保留所有权利。
Experimental and computational results are presented to demonstrate that controlled gradients in elastic modulus alone can result in a pronounced enhancement in the resistance of a surface to frictional sliding contact. The model material chosen for the demonstration of this new concept is polycrystalline alumina infiltrated with aluminosilicate glass. In this system, the elastic modulus increased continuously by 50% from the contact surface to a depth of about 2 mm beneath the surface, with essentially no long-range residual stresses. The strength and local fracture toughness of the contact surface markedly deteriorates as a result of elastic modulus gradation. However, the gradation in elastic modulus alone reduces the principal tensile stresses introduced by frictional sliding contact to such an extent that the glass-infiltrated alumina is far more resistant to contact damage than either monolithic alumina or glass or alumina-glass composite of uniform composition which is equal to the composition of the contact surface. A wide variety of mechanics and materials issues pertaining to sliding contact resistance of homogeneous and graded materials are also addressed. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.