1.1 This practice details procedure

1.1 This practice details procedures for establishing the direct stress and shear stress damage-based design values for use in the damage-based design criterion for FRP vessels and other composite structures. The practice uses data derived from acoustic emission examination of four-point beam bending tests and in-plane shear tests (see ASME Section X, Article RT-8).1.2 The onset oflamina damage is indicated by the presence of signif i cant acoustic emission during the reload portion of load/reload cycles. “Signif i cant emission” is def i ned with historic index.1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in brackets are math-ematical conversions to SI units which are provided for information only and are not considered standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility ofregulatory limitations prior to use.