I have a product: a wristband with a tether. The other end of the tether would be attached to objects of different weight. Based on how much I want the tether to extend under specific weights, i came up with the spring constant of 0.41 lb/in. I ordered the stainless steel spring with the given spring constant (attached). Unfortunately, when the weight exceeds the maximum load possible (3.1 lb), the spring will start to deform plastically (will not go back to its original form). So, i wonder if there is a construction material so that the spring/coil has the given spring constant AND a large maximum load possible (like silicon or rubber coil)?
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