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Question: a biodegradable suture has an initial strength of 10 mpa...

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A biodegradable suture has an initial strength of 10 MPa. The strength of the implanted suture decreases according to the relationship: where σ0 is the original strength, b-4 MPa, t-time in weeks and a is a characteristic time, 1 week. Determine the time at which the strength drops to 25% of the original value

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