This paper presents the results of experiments on seams sewn under constant sewing conditions when the mechanical properties of the plies are different. By using plies of the same fabric along different directions, the effects of the mean properties of the plies as well as their incompatibility are studied, while the other two important factors, the fabric thickness and the compressive modulus, are kept unchanged. The extensibility and strength of such seams will be studied in the second part of this series.
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J. Amirbayat (1992) studied this question.
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