Biaxial stress, sheer, permeability, and peel test method and machine to conduct the same
AssigneeLockheed Martin Corporation
InventorsPaul E. Liggett, Dennis L. Carter, Nicholas L. Barnes, James I. Mascolino, Anthony L. Dunne, Aaron C. Graham
Life of this patent
Estimating the term…
Abstract
The subject invention relates to an apparatus and process for testing various parameters and properties of high strength flexible, fabric laminates. In particular, the apparatus comprises a machine using individually controlled loads to test various material parameters.
Claims30
An apparatus for testing the strength of a material under stress conditions comprising multiple load-generating mechanisms, each such mechanism being operable simultaneously with and independent of each other such mechanism, wherein each load-generating mechanism applies a force that simulates a stress condition in the form of at least one of strain, in-plane sheer, cyclic loading, gas permeability, and film or ply separation.
A multiple load-generating apparatus for testing performance parameters of a material under stress, the apparatus comprising a system of load-bearing arms arranged around the perimeter of the apparatus, each arm contacting the material and adapted to individually and simultaneously apply force to the material, such that the material experiences at least two different stresses.
A method for testing the performance parameters of a material under stress comprising:
- providing a material to be tested;
- positioning the material in a testing apparatus comprising a system of load-generating mechanisms arranged around the perimeter of the apparatus, each mechanism contacting the material and adapted to individually and simultaneously apply force to the material, such that the material experiences at least two different stresses;
- simultaneously applying at least two forces to the material from at least two different mechanisms of the apparatus;
- measuring the amount of force applied to the material;
- and
- using the measured force to predict the failure point of the material under stress.
Dependencies are inferred from the claim text.