Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An in-situ synchrotron diffraction study of stress relaxation in
  titanium: Effect of temperature and oxygen on cold dwell fatigue   There is a long-standing technological problem in which a stress dwell during
cyclic loading at room temperature in Ti causes a significant fatigue life
reduction. It is thought that localised time dependent plasticity in soft
grains favourably oriented for easy plastic slip leads to load shedding and an
increase in stress within a neighbouring hard grain poorly oriented for easy
slip. Quantifying this time dependent plasticity process is key to understand
the complex cold dwell fatigue problem. Knowing the effect of operating
temperature and oxygen content on cold dwell fatigue will be beneficial for
future alloy design to address this problem. In this work, synchrotron X-ray
diffraction during stress relaxation experiments was used to characterise the
time dependent plastic behaviour of two commercially pure titanium samples
(grade 1 and grade 4) with different oxygen content at 4 different temperatures
(room temperature, 75C, 145C and 250C). Lattice strains were measured by
tracking the diffraction peak shift from multiple crystallographic plane
families (21 diffraction rings) as a function of their orientation with respect
to the loading direction. Critical resolved shear stress, activation energy and
activation volume were established for both prismatic and basal slip as a
function of temperature and oxygen content by fitting a crystal plasticity
finite element model to the lattice strain relaxation responses measured along
the loading axis for five strong reflections. Higher strain rate sensitivity
was found to lead to higher plasticity during cold dwell.

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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph