Method for the screwing of threaded elements into non-homogeneous materials

摘要

A screw, joined to an object made of an inhomogeneous material like Styrofoam (RTM), which can be additionally provided with reinforcing fibers should be secured with a maximal torque (A) suitable for the particular material, but without causing damage. The torque ideally to be used for a softer material should increase more gradual than the force used on a firmer material. As soon as the lower surface of the screw head has touched the surface of the object the increase of torque is measured (M) and the maximal usable torque (R) for the special material calculated.