Patent ID: 6878466
Filing Date: 2005-04-12
Classification: B32B,C04B,Y10T

Abstract:
1. A composite comprised of at least two materials that exhibits a threshold strength in which the materials are strongly bonded together; residual, compressive stresses exist in only one of the materials; the material containing the compressive stresses stops cracks extending from the material that does not contain the compressive stress at an applied tensile stress less than the threshold strength; each material has a different chemical composition relative to the other; the material that contains the compressive stresses possesses the smallest volume fraction in the composite; the material containing compressive stresses separates and exists between the material that does not contain compressive stresses; the dimension of material that does not contain compressive stresses, measured perpendicular to the interface between the material that does contain the compressive stress and the material that does not contain the compressive stress, is smaller than 1000 microns; the dimension of material that does contain compressive stresses, measured perpendicular to the interface between the material that does contain the compressive stresses and the material that does not contain the compressive stresses is between 1 times and 0.001 times the dimension of the material that does not contain the compressive stresses; and the compressive stress is greater than 100 MPa.