TWI Frequently asked questions
A large proportion of engineering structures only deform elastically and are made of steel having a Young's Modulus of 207,000MPa and a Poisson's Ratio of 0.3. However, the fact that modelling methods allow complex material behaviorto be analysed means that a variety of materials data is needed. Frequently, the ability to solve a problem is frustrated by a lack of materials input data.
Prediction of plasticity needs a stress versus strain curve. It would be conservative to assume perfect plasticity for most problems. A lower bound yield stress may be found in the material specification. Alternatively, mill sheetdata may be available for the parts being analysed.
More detailed information might be obtained from the following sources:
- NPL, Teddington Middlesex, TW11 0LW; www.npl.co.uk ; e-mail: enquiry@npl.co.uk ;
NPL measurement helpline Tel - +44 20 8977 3222 or Fax - +44 20 8614 0446 - Y S Touloukian, 'Thermophysical properties of high temperature solid materials', Thermophysical Properties Research Center, Purdue University, MacMillan 1967
- D Peckner and I M Bernstein, 'Handbook of stainless steel', McGraw-Hill, 1977
- V E Zinov'yev and V P Itkin, 'Metals at high temperatures: Standard handbook of properties', Hemisphere Publishing Corporation, 1990
- ASM, 'Metals Handbook', 10th Edition
Vol. 1 'Properties and Selection: Iron, steels and high-performance alloys', 1990
Vol. 2 'Properties and Selection: Nonferrous alloys and special-purpose materials', 1990
