{"id":3890,"date":"2020-02-27T17:07:38","date_gmt":"2020-02-27T16:07:38","guid":{"rendered":"http:\/\/zal.aero\/?post_type=news&p=3890"},"modified":"2020-02-27T17:27:36","modified_gmt":"2020-02-27T16:27:36","slug":"hole-drilling-system-how-to-measure-residual-stresses-in-aircraft-structure","status":"publish","type":"news","link":"https:\/\/zal.aero\/en\/news\/hole-drilling-system-how-to-measure-residual-stresses-in-aircraft-structure\/","title":{"rendered":"Hole drilling system – How to measure residual stresses in aircraft structure"},"content":{"rendered":"

For a couple of years, ZAL further develops the infrastructure for laser shock peening<\/a> (LSP). The technology has already shown impressive results. The process creates residual stresses in the material which may lead to deformation of the part. LSP-generated residual stresses can enhance fatigue life, corrosion performance and improve damage tolerance of metal structures. Thus, experts can use this technique as a repair solution of aging plane fleets.<\/p>\n

To evaluate LSP and 3D manufacturing, ZAL has enhanced its research toolbox with an incremental hole drilling system. It is one of the most accepted techniques for measuring depth-resolved residual stresses in metallic parts. The principle works like this: the expert drills a small hole in the material. It deforms the surface around the hole due to the redistribution of residual stresses. From the surface deformations measured by the strain gauges, one back-calculates the originally existing residual stresses.<\/p>\n

The hole drilling method is well known for its robustness and low cost per measurement. It is simple and easy to prepare. The method is semi-destructive due to drilling of the hole in the part.<\/p>\n

The engineers of ZAL equipped the hole drilling system with an optical table and a clamping system to measure residual stresses in parts with complex geometry. As a result, experts determine the stresses in industrial-scale parts (maximum size of 2m x 2m x 2m) in the lab. Moreover, the system is equipped with special clamping for measuring in the field. The hole drilling is portable and thus applicable for large immovable industrial components.<\/p>\n

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To evaluate LSP and 3D manufacturing, ZAL has enhanced its research toolbox with an incremental hole drilling system. It is one of the most accepted techniques for measuring depth-resolved residual stresses in metallic parts.<\/p>\n","protected":false},"template":"","class_list":["post-3890","news","type-news","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/zal.aero\/en\/wp-json\/wp\/v2\/news\/3890","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zal.aero\/en\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/zal.aero\/en\/wp-json\/wp\/v2\/types\/news"}],"version-history":[{"count":1,"href":"https:\/\/zal.aero\/en\/wp-json\/wp\/v2\/news\/3890\/revisions"}],"predecessor-version":[{"id":3895,"href":"https:\/\/zal.aero\/en\/wp-json\/wp\/v2\/news\/3890\/revisions\/3895"}],"wp:attachment":[{"href":"https:\/\/zal.aero\/en\/wp-json\/wp\/v2\/media?parent=3890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}