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Many ultrasonic methods are able to accurately predict in-plane stresses inside a controlled laboratory environment but struggle to be robust outside, in a real-world setting. That is because these methods rely either on knowing beforehand the material constants (which are difficult to acquire) or require significant calibration for each specimen. This paper presents an ultrasonic method to evaluate the in-plane stress in situ directly, without knowing any material constants. The method is simple in principle, as it only requires measuring the speed of two angled shear waves. It is based on a formula that is exact for incompressible solids, such as soft gels or tissues, and is approximately true for compressible \u201chard\u201d solids, such as steel and other metals. The formula is validated by finite element simulations, showing that it displays excellent accuracy, with a small error on the order of 1%.<\/jats:p>","DOI":"10.1121\/10.0002959","type":"journal-article","created":{"date-parts":[[2020,12,24]],"date-time":"2020-12-24T12:16:35Z","timestamp":1608812195000},"page":"3963-3970","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":27,"title":["An ultrasonic method to measure stress without calibration: The angled shear wave method"],"prefix":"10.1121","volume":"148","author":[{"given":"Guo-Yang","family":"Li","sequence":"first","affiliation":[{"name":"Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital 1 , Boston, Massachusetts 02114, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3229-5451","authenticated-orcid":false,"given":"Artur L.","family":"Gower","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, University of Sheffield 2 , Sheffield, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michel","family":"Destrade","sequence":"additional","affiliation":[{"name":"School of Mathematics, Statistics and Applied Mathematics 3 , NUI Galway, Galway, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2020,12,24]]},"reference":[{"key":"2023080804374934300_c1","volume-title":"Electromagnetic Acoustic Transducers: Noncontacting Ultrasonic Measurements Using EMATs","year":"2017"},{"issue":"1","key":"2023080804374934300_c2","doi-asserted-by":"publisher","first-page":"60","DOI":"10.1016\/j.msea.2006.04.062","article-title":"Residual stress measurements in coil, linepipe and girth welded pipe","volume":"437","year":"2006","journal-title":"Mater. 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