tailieunhanh - ON A SHOCK PROBLEM INVOLVING A NONLINEAR VISCOELASTIC BAR NGUYEN THANH LONG, ALAIN PHAM NGOC DINH,

ON A SHOCK PROBLEM INVOLVING A NONLINEAR VISCOELASTIC BAR NGUYEN THANH LONG, ALAIN PHAM NGOC DINH, AND TRAN NGOC DIEM Received 3 August 2004 and in revised form 23 December 2004 We treat an initial boundary value problem for a nonlinear wave equation utt − uxx + K |u|α u + λ|ut |β ut = f (x,t) in the domain 0 | ON A SHOCK PROBLEM INVOLVING A NONLINEAR VISCOELASTIC BAR NGUYEN THANH LONG ALAIN PHAM NGOC DINH AND TRAN NGOC DIEM Received 3 August 2004 and in revised form 23 December 2004 We treat an initial boundary value problem for a nonlinear wave equation utt - uxx K u au A ut fut f x t in the domain 0 x 1 0 t T. The boundary condition at the boundary point x 0 of the domain for a solution u involves a time convolution term of the boundary value of U at x 0 whereas the boundary condition at the other boundary point is of the form ux 1 t K1u 1 t A1ut 1 t 0 with Ki and Al given nonnegative constants. We prove existence of a unique solution of such a problem in classical Sobolev spaces. The proof is based on a Galerkin-type approximation various energy estimates and compactness arguments. In the case of a f 0 the regularity of solutions is studied also. Finally we obtain an asymptotic expansion of the solution u P of this problem up to order N 1 in two small parameters K A. 1. Introduction Given T 0 we consider the problem to find a pair of functions u P such that utt - uxx F u ut f x t 0 x 1 0 t T ux 0 t P t ux 1 t Kiu 1 t Aiut 1 t 0 u x 0 u0 x ut x 0 u1 x where F u ut K u au A ut fut u0 u1 f are given functions K K1 a f A and A1 0 are given constants and the unknown function u x t and the unknown boundary value P t satisfy the following Cauchy problem for ordinary differential equation P t w2P t hutt 0 t 0 t T P 0 P0 P 0 P1 Copyright 2006 Hindawi Publishing Corporation BoundaryValue Problems 2005 3 2005 337-358 DOI 338 On a shock problem involving a nonlinear viscoelastic bar where w 0 h 0 P0 Pl are given constants. Problem describes the shock between a solid body and a nonlinear viscoelastic bar resting on a viscoelastic base with nonlinear elastic constraints at the side constraints associated with a viscous frictional resistance. In 1 An and Trieu studied a special case of problem - with a p 0 and f u0 u1 and P0 vanishing .

TÀI LIỆU LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.