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The shape of a stress test specimen was so chosen that a uniform two-dimensional tensile stress field could be produced in it. The ratio of the two principal stresses of the field can be varied arbitrarily between 0 and 1, i.e. any desired tensile stress state is obtainable. The accuracy of the stress produced in the specimen was checked by means of photoelastic models.
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Mönch et al. (1963) studied this question.
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