Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Apparatus for Measuring Strength in Biaxial Compression   Most measurements of compressive strength of ductile materials have involved
Hopkinson-Kolsky bars or Taylor anvils placing samples in uniaxial compression.
In these geometries strain is limited by the tendency of the sample to petal,
in analogy to necking in uniaxial tension. Estimation of strength for any other
form of the stress tensor requires assuming a shape for the yield surface;
because data exist only for uniaxial compression these assumptions are
untested. In an imploding spherical shell compression is biaxial, the plastic
strain may not be small and the material behavior may be nonlinear as a result
of work hardening and heating by plastic work. We propose to measure the
strengths of materials in biaxial compression,both quasistatically and
dynamically, using the compression of thin spherical shells. We suggest
surrounding the shell with an annulus filled with a mixture of H$_2$ and Cl$_2$
gases whose volumetric detonation is initiated by a flash of blue and
near-ultraviolet light. Less promising approaches are described in appendices.

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The categories of this paper are: nlin
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: cs