Estimating Method of the Impact Strength of FRP Plates by Drop Weight Tests.

貞幸, 宇治橋; 克典, 田中; 浩之, 松本; 忠晴, 足立

doi:10.1299/kikaia.63.2560

Cited by 2 publications

(1 citation statement)

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“…Two semiconductive strain gages were placed symmetrically with respect to the cross-section of impact bar at half the length of the bar, to eliminate the effect of bending deflection. The load time-history F(t) at the impact bar end and impact point were calculated from the measured strain ε(t) by the following equation (15) :…”

Section: Drop Weight Impact Testmentioning

confidence: 99%

Estimation of Impact Damage in C/C Composites by Drop Weight Tests (Wavelet Analysis of Impact Load)

Yoshioka

Takahashi

2008

JMMP

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The evaluation of impact damage properties and strength of C/C composites is becoming important, due to its low impact strength. In this study, the impact damage is evaluated by using the impact load-deflection diagrams and absorbed energy of specimens on a drop weight impact test. The measured impact load is decomposed in approximation components and detail components by multiple-resolution analysis based upon the wavelet transform. And then the possibility of wavelet analysis for estimating the impact damage is studied. The results are as follows: (1) The Daubechies' wavelet is useful for smoothing the impact load signals by multiple resolution analysis in wavelet transform. (2) In the low impact energy that most of the damage does not occur, the approximation component result demanded by wavelet analysis accords with the wave pattern of numerical one that is removed free vibration component.

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Section: Drop Weight Impact Testmentioning

confidence: 99%