| Cluster Porosity Effects on Transverse Fillet Weld Strength |
JAN 84 |
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| Authors:
E. P. Cox; H. S. Lamba
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 | The effect of cluster porosity on the static shear strength of A514F steel was investigated on transverse fillet welds. Cluster porosity in amounts up to 20% was introduced into the welds. Up to approximately 10%, the cluster porosity had no effect on strength, but greater amounts caused a proportional reduction in strength. Linear discontinuities were often masked by the porosity in x-ray radiographs and were generally more deleterious than the ... |
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| Ductile Fracture Behavior of Wrought Steels |
JUL 80 |
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| Authors:
E. P. Cox; F. V. Lawrence Jr.; CATERPILLAR TRACTOR CO PEORIA IL
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| A two failure criteria model based on plasticity limit load (LL) theory and linear elastic fracture mechanics (LEFM) is proposed for characterizing the fracture behavior of ductile structural metals. Failure is considered to occur at the lower load predicted by the two failure criteria. The variables involved in the two failure criteria model are: fracture toughness, tensile strength, relative crack length and geometry. |
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| The Effects of Weld Porosity on the Fracture Toughness of A514F Steel. |
SEP 1977 |
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| Authors:
E. P. Cox; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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| This report presents the results of an investigation conducted to evaluate the effects of clustered and linear porosity on the impact (dynamic tear) and dynamic fracture toughness of American Society for Testing and Materials (ASTM) A514 grade F steel welds. Tests were conducted using standard 1.59-cm dynamic tear specimens in a dynamic tear machine. Tests were also conducted using instrumentation recently developed for use with the dynamic tear machine. Results ... |
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| Evaluation of the Corrosion Resistance of Alternate Revetment Wire Fabric Materials in the Lower Mississippi River. |
JUL 1977 |
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| Authors:
E. P. Cox; C. G. Chen; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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| This report presents the results of a study of the corrosion resistance and strength of alternate fabric materials for use in articulated concrete revetment mattresses to be placed on the lower banks of the Mississippi River. Three groups of materials-stainless steels, bimetallics, and organically coated low-carbon steels-were evaluated based on short-term electrochemical laboratory tests, laboratory sensitization evaluations, and exposures of up to approximately 4 years in freshwater and 15 months ... |
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| The Effects of Base Metal Notch Orientation and Acuity and Weld Porosity on the Dynamic Tear Toughness of A514F Steel. |
FEB 1977 |
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| Authors:
E. P. Cox; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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| The effects of weld porosity on the dynamic tear properties of A514F steel butt welds were assessed in a program which conducted dynamic tear tests in six areas of experimentation: (1) the base plate steel in the longitudinal and transverse orientations; (2) sound weld metal; (3) weld metal containing clustered porosity; (4) weld metal containing linear porosity; (5) stress-relieved weld metal; and (6) base metal in the longitudinal and transverse ... |
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| Effect of Lack of Penetration on Fatigue Resistance of High-Strength Structural Steel Welds. |
FEB 1977 |
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| Authors:
Y. Tobe; E. P. Cox; F. V. Lawrence Jr; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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| Zero-to-tension fatigue tests were carried out on double-V butt welds of ASTM A514 steel plate, 20 mm in thickness, which contained full-length lack of penetration (LOP) defects. The fatigue crack initiation and propagation portions of the specimens' fatigue lives were experimentally separated. Compression-to-tension fatigue tests were carried out on prime base plate, as-welded sound joints, and reinforcement-removed welds to experimentally determine the fatigue strength reduction factor (Kf) of the LOP ... |
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| The Effects of Clustered Porosity on the Shear Strength of A 514F Transverse Fillet Welds. |
DEC 1976 |
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| Authors:
H. S. Lamba; E. P. Cox; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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| This report presents the results of a study of the effects of clustered porosity on the transverse shear strength of A 514F steel weldments. The amount of porosity induced into the specimens ranged from zero to over 20 percent of the fracture surfaces. Results indicate that clustered porosity, up to about 10 percent, has little effect on the shear strength or ductility of transverse shear welds. A slight decline in ... |
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| Failure Analysis of Ozark, Arkansas, Power Plant Socket-Head Cap Screws. |
AUG 1976 |
29 pages |
| Authors:
E. P. Cox; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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 | This research analyzed the socket-head cap screws which failed in the turbines of the Ozark Power Plant, Ozark, AR. The cause of failure was found to be fatigue in improperly heat-treated cap screws. The reduced fatigue strength of the cap screws was further aggravated by the presence of a sharp fillet where the shaft and head joined and by the nonuniform preloads imposed on the cap screws during installation. Several ... |
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| INFLUENCE OF INADEQUATE JOINT PENETRATION ON TENSILE BEHAVIOR OF A514 STEEL WELDS |
MAY 76 |
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| Authors:
F. V. Lawrence; E. P. Cox
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| Influence of Heat Input and Lack of Penetration Length on Static Tensile Strength of High-Strength Structural Steel Weldments. |
JUN 1975 |
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| Authors:
F. V. Lawrence Jr.; E. P. Cox; E. M. Honig Jr; ILLINOIS UNIV AT URBANA-CHAMPAIGN DEPT OF CIVIL ENGINEERING
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| This report presents findings of an investigation of the influence of heat input and lack of penetration (LOP) length on static tensile properties of A517(USS T-1) steel weldments. Heat inputs of 20, 30, 50, and 90 kJ/in. were studied in full penetration welds. Results showed that tensile properties of the weld metal were maximized at 30 kJ/in. heat input. In full-length LOP specimens, it was shown that tensile strength decreased ... |
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| The Effect of Lack of Penetration Defects on Static Tensile Behavior of High-Strength Structural Steel Weldments. |
FEB 1975 |
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| Authors:
F. V. Lawrence Jr.; E. P. Cox; E. M. Honig Jr; ILLINOIS UNIV URBANA DEPT OF CIVIL ENGINEERING
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| This paper investigates the effect of lack of penetration (LOP) in welded T-1 steel plates on tensile properties. Tensile tests of welded plates having varying sizes of LOP were conducted and monitored for acoustic emissions. Fracture surfaces were examined. Using a documented computer program the J integral of fracture mechanics was evaluated at several points for each specimen. An anticipated decrease in tensile strength and ductility with increasing LOP was ... |
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