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弹性波是应力波的一种,扰动或外力作用引起的应力和应变在弹性介质中传递的形式。弹性介质中质点间存在着相互作用的弹性力。某一质点因受到扰动或外力的作用而离开平衡位置后,弹性恢复力使该质点发生振动,从而引起周围质点的位移和振动,于是振动就在弹性介质中传播,并伴随有能量的传递。
Elastic wave is a kind of stress wave, and the form of stress and strain caused by disturbance or external force is transmitted in elastic medium. Elastic medium in the presence of the interaction between the elastic force. When a certain particle leaves the equilibrium position due to the disturbance or external force, the elastic restoring force causes the particle to vibrate, causing displacement and vibration of surrounding particles. Then, the vibration propagates in the elastic medium with energy transfer.