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美国俄亥俄州州立大学焊接工程系的S·I·Rokhlin和Laszlo Adler提出了一种用超声波测量焊点抗剪强度的方法,这种方法的理论基础是:Lamb波通过固体板中孔径的穿透系数与这个孔径的大小有关.穿透系数与孔径的关系可以用解析表达式给出. 测量方法如图1所示.由上层板上发射换能器激发的兰姆波,入射到焊接区域,部分入射能量被反射,而大部分能量通过两板相接区域进入下面的板中,被
S. Rokhlin and Laszlo Adler, Department of Welding Engineering, Ohio State University, USA, put forward a method for measuring the shear strength of solder joints by using ultrasonic waves. The rationale of this method is that the penetration of the Lamb waves through the apertures in the solid plate The coefficient is related to the size of this aperture.The relationship between the penetration coefficient and the aperture can be given by the analytic expression.The measurement method is shown in Figure 1. The Lamb wave excited by the transmitting transducer on the upper plate is incident on the welding area, Some of the incident energy is reflected and most of the energy enters the underlying plate through the contiguous area of the two plates and is