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Nasa Technical Reports Server (ntrs) 20010020246%3a A Comparison Of Quasi Static Indentation Testing To Low Velocity Impact Testing by Nasa Technical Reports Server (ntrs)

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1NASA Technical Reports Server (NTRS) 20010020246: A Comparison Of Quasi-Static Indentation Testing To Low Velocity Impact Testing

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The need for a static test method for modeling low-velocity foreign object impact events to composites would prove to be very beneficial to researchers since much more data can be obtained from a static test than from an impact test. In order to examine if this is feasible, a series of static indentation and low velocity impact tests were carried out and compared. Square specimens of many sizes and thickness were utilized to cover the array of types of low velocity impact events. Laminates with a n/4 stacking sequence were employed since this is by the most common type of engineering laminate. Three distinct flexural rigidities under two different boundary conditions were tested in order to obtain damage due to large deflections, contact stresses and both to examine if the static indentation-impact comparisons are valid under the spectrum of damage modes that can be experienced. Comparisons between static indentation and low velocity impact tests were based on the maximum applied transverse load. The dependent parameters examined included dent depth, back surface crack length, delamination area and to a limited extent, load-deflection behavior. Results showed that no distinct differences could be seen between the static indentation tests and the low velocity impact tests, indicating that static indentation can be used to represent a low velocity impact event.

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  • Title: ➤  NASA Technical Reports Server (NTRS) 20010020246: A Comparison Of Quasi-Static Indentation Testing To Low Velocity Impact Testing
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  • Language: English

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