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中文摘要：
将力锤与杆撞击后由小到大和由大到小的局部变形用一个无质量的具有刚度为k的弹簧来模拟，推导出力锤与杆撞击的撞击力和脉冲作用时间表达式。运用ANSYS／LS-DYNA软件模拟了不同质量、撞击头半径和弹性模量的撞击杆以不同的速度撞击长杆的应力波形态和脉冲宽度，并在实验室对预应力锚杆用不同质量、不同硬度的力锤进行了激振试验，从而进一步阐述了锚杆无损检测力锤激励机理，为更准确地实施锚杆无损动力检测，提高工程检测质量创造了条件。
英文摘要：
Hammer test is a common method for bolt nondestructive dynamic test, but the potential error reading from the wave pattern frequently occurs due to the inconsistent wave caused by the small impact area. The engineer dynamic detection is therefore of great significance in analyzing the hammer mechanic properties. In this paper, the impact between the hammer and the pole was simulated as a spring whose stiffness is K and whose mass is zero, so as to probe into the local deformation. Then the expression of the impact force and the pulse time during the impact were derived. The ANSYS/LS-DYNA software was used to simulate the stress wave pattern and the pulse width in the process, as the hammers had different masses and the radius of impact head and its elastic modulus had different impact velocities, and the prestressed bolt was excited by hammers with different masses and different hardnesses in laboratory. The results further describe the mechanics of the impact of the hammer and rock bolt and creates the condition for the improvement of the engineering detection quality in the rock bolt nondestructive dynamic detection.
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