A single-parameter logarithmic equation is suggested for the calibration of the potential drop method for measuring crack length in compact tension specimens. This equation follows the correct asymptotic solution for long crack lengths and is shown to hold for even very short crack lengths for specimens with a small notch. Use of this equation provides a first step towards evaluation of calibration data for anomalies such as those associated with variation of electrical conductivity due to plasticity of the crack tip and with uneven crack growth. In addition, use of this equation as a two-parameter model allows determination of the electrical resistivity of the specimen from the calibration data. Data are presented for specimens with large notches which support the results obtained in a previous paper by a numerical method coupled with conformal mapping.
M.E. Orazem and W. RuchSubscripts i imaginary r real
r i c a t e d a l u m i n u m-c o p p e r-l i t h i u m a l l o y s and an aluminum-lithium b i n a r y a l l o y were examined. The e l a s t i c p r o p e r t i e s were measured a s a f u n c t i o n of aging time, aging temperature, amount of s t r e t c h i n g and t e s t i n g d i r e c t i o n. An i n c r e a s e i n Young's modulus due t o d e l t a prime and T1 p r e c i p i t a t i o n h a s been measured and t r e a t e d q u a n t i t a t i v e l y i n c l u d i n g p r e c i p i t a t i o n k i n e t i c s. A s i g n i f i c a n t d e c r e a s e of a b o u t 5 % i n t h e modulus of e l a s t i c i t y was f o u n d i n t h e peak age c o n d i t i o n .
Nach Untersuchungen an gekerbten Proben einer reinen und zweier technischer AlMgSi1‐Legierungen mit unterschiedlichem Gefügezustand zeigen, daß die beiden technischen Legierungen mit feinem (TF) und grobem Gefüge (TG) gleiche Lebensdauer bei stark unterschiedlicher Bildungsdauer von Rissen aufweisen.
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