Duncan, B C; Pearce, A (1999) Comparison of impact and high rate tests for determining properties of adhesives and polymers needed for design under impact loading. NPL Report. CMMT(A)134

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Abstract

Finite element analysis (FEA) is a powerful technique for the design and analysis of structures sustaining impacts. However, reliable predictions require a suitable model for the material behaviour and material properties at appropriate strain rates. An aim of this project PAJ2 was to establish methods for determining such material properties at high strain rates that would be suitable as FEA input. In this report, the abilities of high speed servo-hydraulic test machines and instrumented falling weight impact apparatus for generating high strain rate, tensile test data suitable for design have been assessed. The data generated by these tests are less accurate than from conventional test equipment operating at lower strain rates. If this limitation is born in mind then the data can be used for design purposes. The data generated from falling weight impact tests are inherently noisier than data from the high rate test machines. However, where strains to failure are reasonably large (ca. 0.1), and the signal to noise ratio is acceptable, it should be possible to extract design data from the tensile impact test.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)134
Subjects:	Advanced Materials Advanced Materials > Adhesives Advanced Materials > Polymers
Last Modified:	02 Feb 2018 13:18
URI:	http://eprintspublications.npl.co.uk/id/eprint/2783

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