CALCULATION METHOD AND CALCULATION APPARATUS FOR CONTACT SURFACE PRESSURE AND SUBSURFACE STRESS

PROBLEM TO BE SOLVED: To provide a calculation method for a contact surface pressure allowing the high-accuracy calculation of the contact surface pressure as compared with a uniform surface pressure element, having a short calculation time as compared with a finite element method or a boundary element method, and can be easily used. SOLUTION: A square area R slightly larger than a contact area is set, and the area is cut into a plurality of square elements e in a mesh form arranged in two side directions orthogonal to each other. The optional square element e is subdivided. For each square element e, 9 pieces of nodes respectively positioned at four corners, the centers of respective sides and the center of the element are set, and it is assumed that a contact surface pressure distribution indicated by a secondary function is generated inside each square element e. An equality wherein a value obtained by superimposing an influence exerted on displacement in the contact surface normal direction of each node by the square element e about all the square elements is equal to the displacement in the contact surface normal direction of each node is determined. An equality wherein the sum of loads supported by the square elements e is equal to an external force applied between contact objects is obtained. The contact surface pressure of each square element satisfying both the equalities is determined. COPYRIGHT: (C)2010,JPO&INPIT