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RISStress Intensity, Stress Concentration, and Fatigue Crack Growth Along Evacuator Holes of Pressurized, Autofrettaged Tubes
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The geometry analyzed consists of a thick-walled cylinder having a small-diameter evacuator hole penetrating radially through the wall. The loading involves pressure acting on the i.d. of the ...
Fatigue Life Analyses and Tests for Thick-Wall Cylinders Including Effects of Overstrain and Axial Grooves
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A fracture mechanics-based fatigue life analysis was developed for overstrained, pressurized thick-wall cylinders with one or several semi-elliptical-shaped axial grooves at the inner diameter. The ...
Bauschinger Effect Design Procedures for Autofrettaged Tubes Including Material Removal and Sachs’ Method
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Autofrettage is used to introduce advantageous residual stresses into pressure vessels and to enhance their fatigue lifetimes. The Bauschinger effect serves to reduce the yield strength in ...
Post-Autofrettage Thermal Treatment and Its Effect on Reyielding of High Strength Pressure Vessel Steels
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The autofrettage process of a thick walled pressure vessel involves applying tensile plastic strain at the bore of the vessel, which reverses during unloading and results in favorable compressive ...
Yield-Before-Break Fracture Mechanics Analysis of High-Strength Steel Pressure Vessels
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Case study examples of fracture mechanics testing and analysis of Ni-Cr-Mo high strength steel cannon tubes are presented. The testing and analysis include the situation of significant plastic ...
Mechanisms and Modeling Comparing HB7 and A723 High Strength Pressure Vessel Steels
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: HB7, an ultra-clean, high strength pressure vessel steel manufactured in France, is compared to A723 steel. This steel, suggested as an improved pressure vessel material is currently being ...
Compressive Thermal Yielding Leading to Hydrogen Cracking in a Fired Cannon
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Investigation of environmental cracking of a 1100-MPa yield strength A723 steel cannon tube subjected to prototype firings is described. Metallographic results show cracking of the steel beneath ...
Hydraulic Versus Swage Autofrettage and Implications of the Bauschinger Effect
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A hybrid method is presented which permits calculation of residual stresses in a swage autofrettaged tube including Bauschinger effect. The results are generally supported by three types of ...
Improved Finite Element Model to Predict the Reverse Loading Behavior of Autofrettaged A723 and HB7 Cylinders
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Ideal isotropic or kinematic hardening is often utilized in order to simplify the modeling of the loading and reverse loading behavior of materials when using finite element analysis. Unfortunately, ...
Fatigue Life Measurements and Analysis for Overstrained Tubes With Evacuator Holes
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Sections of cannon tubes with inner radius of 53, 60, and 78 mm were cycled from near zero to 100–300 MPa internal pressure until fatigue failure occurred. The failure locations were along ...