Measurement of interfacial strength of a composite material
Patent 5255562 Issued on October 26, 1993. Estimated Expiration Date: 
October 7, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 7, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesHardness testing device for pipes Apparatus for measuring capsule plug, granule and pellet hardness Paving material testing machine Method of predicting fatigue lifetimes of metallic structures Patent #: 4947341 InventorsAssigneeApplicationNo. 957733 filed on 10/07/1992US Classes:73/160, Filament73/78, HARDNESS702/42, Stress or strain measurement702/157Radius or diameterExaminersPrimary: Yasich, Daniel M.Attorney, Agent or FirmInternational ClassesG01D 001/02G01N 003/24 Foreign Application Priority Data1992-01-24 JPAbstractInterfacial strength of a composite material between its fibers and matrix is measured by observing a sample material through a microscope, measuring the diameter of selected one of the fibers by moving indicators in the field of vision of the microscope, applying pressure on the selected fiber by means of an indentator and measuring both the displacement of the indentator and the load on the fiber, and thereby obtaining a curve between the indentator displacement and the square root of the load. The curve has a straight portion and the point at which the curve begins to deviate from the straight portion is determined. The load value corresponding to this point is used to calculate debonding and sliding interfacial shear strengths of the material according to given formulas. | |
