scholarly journals Nondestructive Evaluation of Change in Spall Damage under Repeated Plate Impact Tests by Flyer Plate of Different Thickness

2009 ◽  
Vol 75 (757) ◽  
pp. 1222-1229
Author(s):  
Naoya NISHIMURA ◽  
Katsuhiko MURASE ◽  
Toshihiro ITO ◽  
Motoharu KONDO
Keyword(s):  
Nondestructive Evaluation ◽  
Flyer Plate ◽  
Plate Impact ◽  
Impact Tests ◽  
Spall Damage ◽  
Different Thickness

scholarly journals Ultrasonic Detection of Spall Damage Distribution Subjected to Plate Impact Test with Different Thickness

2018 ◽  
Vol 183 ◽  
pp. 02029
Author(s):  
Naoya Nishimura ◽  
Toshihiro Ito ◽  
Takeru Watanabe
Keyword(s):  
Tensile Stress ◽  
Impact Test ◽  
Plate Thickness ◽  
Flyer Plate ◽  
Plate Impact ◽  
Target Plate ◽  
Damage Distribution ◽  
Spall Damage ◽  
The Impact ◽  
Different Thickness

Plate impact test on medium carbon steel were carried out to the target plate by impacting the flyer plate with one-third and two-thirds thickness of the target plate. The spall damage within the target plate was evaluated non-destructively with a low frequency scanning acoustic microscope as well as ultrasonic velocity and backscattering intensity. We observed the spall damage distribution by the B-and Cscan images. The distribution of spall damage through the plate thickness depends on the tensile stress area within the target plate. The difference of spall damage distribution was investigated by the plate impact test by flyer plate with different thickness. In the plate impact test by the flyer plate with 1/3 target plate thickness, the spall damage was generated by tensile stress area which superposed in the back surface side. On the other hand, in the case of 2/3 target plate thickness, the spall damage was detected at the impact surface side. By generating the spall damage in the different position through the target thickness, it will be possible to evaluate the accumulation of spall damage by reflection and transmission of the stress wave at the internal damage subjected to repeated impact.

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