Method of detecting the onset of cracking in articles during dynamic testing
Patent 4283956 Issued on August 18, 1981. Estimated Expiration Date: 
May 10, 1999. 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.
May 10, 1999. 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 References 3228238 3442120 InventorsAssigneeApplicationNo. 06/037710 filed on 05/10/1979US Classes:73/799, Specimen cracking or crack propagation73/577Fatigue studyExaminersPrimary: Myracle, Jerry W.Attorney, Agent or FirmInternational ClassesG01N 3/32 (20060101)G01N 29/22 (20060101) G01N 29/12 (20060101) G01N 3/00 (20060101) Foreign Application Priority Data1978-05-17 DEAbstractA method is disclosed for detecting the onset of cracking in an article subjected to dynamic loading. The article is subjected to a dynamically changing load, and additionally is loaded and vibrated at its natural frequency. The onset of a crack in the article is determined by noting a change in its natural frequency. | |
