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An experimental investigation of cold-formed stainless steel hollow sections subjected to web crippling is presented in this paper. Tests were conducted on square and rectangular hollow sections of austenitic stainless steel type 304. Tensile and compression coupon tests were performed to obtain the longitudinal tension and transverse compression material properties. The web crippling tests were conducted under two loading conditions for end-two-flange and interior-two-flange specified in the current American Specification and Australian/New Zealand Standard for cold-formed stainless steel structures. The test strengths obtained from this study and the test strengths of stainless steel lipped channel sections under end-one-flange and interior-one-flange loading conditions conducted by other researchers are compared with the design strengths obtained using the current American Specification, Australian/New Zealand Standard and European Code for cold-formed stainless steel structures. In addition, the test strengths are also compared with the design strengths obtained using the unified web crippling equation as specified in the North American Specification for cold-formed carbon steel structural members. A unified web crippling equation for cold-formed stainless steel sections with single web is proposed in this paper. [ABSTRACT FROM AUTHOR]

Objectives: To review governmental guidelines on amalgam use worldwide and to assess trends in the usage of amalgam and composite materials in restoration of posterior teeth. Methods: A letter was sent to 24 government health agencies or representative organisations requesting details of regulations pertaining to amalgam use. A literature search was carried out in order to identify papers in which the incidence of amalgam and composite restorations was stated. Results: Ten replies were received, indicating few restrictions on the use of amalgam. Results obtained from published work appear to indicate that amalgam use is declining, but at rates which are unclear in many countries because of the paucity of published data. Amalgam use has been found to be decreasing in the USA, Australia and Scandinavia, with lesser decreases being apparent in the UK. Conclusions: There are few restrictions to the use of amalgam worldwide. In countries where data are available, such as USA, Australia and Scandinavia, amalgam use has been found to be decreasing, with smaller decreases being apparent in the UK. [ABSTRACT FROM AUTHOR]