Banetto kun, hello.
I have a question about the material of thin flat springs that you sent me. In the formula (7.6) on your website, there are η and φ values. What kind of values do these represent? When calculating the stress at δ <0.2L, what kind of value should η be? Also, I think formula (7.6) is a calculation formula for cantilever springs, but what formula can we use for springs with 2 fixed ends? I'm sorry to ask you a lot of questions.
Yoshiaki, hello!
[Question] In the formula (7.6), there are η and φ values. What kind of values do these represent? [Answer] This is the correction coefficient when the deflection is large (δ> 0.2). In the material sent, they are the large deflection coefficients of the cantilever springs (Fig. 7.2).
[Question] What kind of value should η be when calculating the stress at δ> 0.2L?
[Answer] Obtain η from the graph in Fig. 7.2 of the material. The horizontal axis is w, which is calculated by the formula shown on the X-axis of the graph in Fig. 7.2, and η at w is obtained from the graph.
[Question] I think that formula (7.6) is a calculation formula for cantilever springs, but what formula can we use springs with 2 fixed ends?
[Answer] We will send you additional materials for your reference.
