Study on strength design criteria due to introduced defects in Inconel 718 fabricated by metal 3D printer

2019 ◽  
Vol 2019 (0) ◽  
pp. S11102
Author(s):  
Manatsu OGAWAHARA ◽  
Shinya SASAKI
Keyword(s):  
Inconel 718 ◽  
Design Criteria ◽  
3D Printer ◽  
Strength Design ◽  
Strength Design Criteria

Evaluation of Strength Design Criteria and Plastic Flow Criteria for Pressure Vessels

2014 ◽  
Author(s):  
Xian-Kui Zhu
Keyword(s):  
Plastic Flow ◽  
Axial Flow ◽  
Pressure Vessels ◽  
Burst Pressure ◽  
Design Criteria ◽  
Strength Criteria ◽  
Integrity Assessment ◽  
Strength Design ◽  
Strength Design Criteria ◽  
Flow Criterion

The present paper evaluates the traditional strength design criteria and recently developed plastic flow criteria used in the structural design and integrity assessment for pressure vessels. This includes (1) a brief review of the traditional strength criteria used in ASME Boiler and Pressure Vessel (B&PV) Code, (2) a discussion of the shortcoming of existing strength criteria when used to predict the burst pressure of pressure vessels, (3) an analysis of challenges, technical gaps and basic needs to improve the traditional strength design criteria, (4) a comparison of strength theory and flow theory for ductile pressure vessels, (5) an evaluation of available flow criteria and their shortcoming in prediction of failure pressure of pressure vessels, (6) an introduction of newly developed multi-axial flow criterion and its application to pressure vessels, and (7) a demonstration of experimental validations of the new flow criterion when used to predict the burst pressure of pressure vessels. On this basis, several recommendations are made for further study to improve the existing strength design and integrity assessment methods of pressure vessels.

Research on Lightweight Technology Application in River-Crossing and Military Bridge Equipment

2013 ◽  
Vol 753-755 ◽  
pp. 486-494
Author(s):  
Yin Long Zhang ◽  
Shi Chuan Bian ◽  
Jun Xiang Lin ◽  
Zhao Xiang Shen
Keyword(s):  
Lightweight Design ◽  
Rapid Development ◽  
High Strength ◽  
Design Criteria ◽  
Basic Principles ◽  
Technology Application ◽  
Strength Design ◽  
Military Bridge ◽  
Strength Material ◽  
Strength Design Criteria

Lightweight technology application in river-crossing and military bridge equipment has important significance to promote rapid development. Lightweight can efficiently reduce the weight, promote structure optimization and improve performance of the river-crossing and military bridge equipment. After basic principles and main technologies of the lightweight application in the river-crossing and military bridge equipment components are summarized, strength design technologies for the lightweight of the equipment components are discussed, and simple shape components strength design criteria under tension/ compression, bending, shearing and torsion are analyzed, which is extended to general lightweight components strength design criteria. On the basis of the lightweight design principles and strength design criteria, appropriate design methods and optimization strategies are selected, suitable lightweight high-strength material is chosen according to research and development demands, and the lightweight purpose for the river-crossing and military bridge equipment is realized.

Ultimate Strength Design of Racks for Jack-Up Units

1986 ◽  
Vol 108 (3) ◽  
pp. 413-423
Author(s):  
Hiroshi Honda
Keyword(s):  
Ultimate Strength ◽  
Cross Section ◽  
Elastic Stress ◽  
Shear Fracture ◽  
Design Method ◽  
Design Criteria ◽  
Fracture Test ◽  
Strength Design ◽  
The Subject ◽  
Jack Up

The subject of paper discusses an approach taken in evaluating the load acting on racks for jack-up units (the jack load) together with its computed results. The fracture test of a full-scale rack for a jack-up unit and a finite-element elastic stress analysis for this rack were also conducted. These results led to new design criteria for the ultimate strength design method of racks for jack-up units, when exposed to a combination of loads including stormy conditions. Typically, the ultimate strength of the racks was evaluated on the assumption that the cross section of the rack tooth plastically collapses at its root. During this investigation, it was shown, however, that the ultimate strength of the racks needs to be evaluated also on the premise that the rack tooth is subject to shear fracture caused by its mating pinion tooth.

scholarly journals Durability-Aimed Design Criteria of Cement-Stabilized Loess Subgrade for Railway

2021 ◽  
Vol 11 (11) ◽  
pp. 5061
Author(s):  
Fuyu Wang ◽  
Weichen Pang ◽  
Xingyuan Qin ◽  
Leilei Han ◽  
Yingjun Jiang
Keyword(s):  
Dynamic Strength ◽  
Strength Reduction ◽  
Design Criteria ◽  
Freeze Thaw ◽  
Long Term Stability ◽  
Railway Construction ◽  
Critical Dynamic ◽  
Strength Design Criteria ◽  
Safety And Stability

The subgrade is the foundation of railway construction, so its strength and stability are very important to ensure the safety and stability of a train. Loess is widely distributed in northwestern China, and it must be stabilized before being used in railway subgrade construction because loess is sensitive to water. Railway subgrade withstands not only the train load but also repeated attacks from the environment and climate because it has to be exposed to natural environment after construction. Therefore, the strength of cement-stabilized loess deteriorates continuously because of the above factors. Taking account of long-term stability, the influences of load on the cement-stabilized loess as well as the strength reduction laws of cement-stabilized loess under wet–dry cycling and freeze–thaw cycling were analyzed in this study. Additionally, the respective reduction coefficients were obtained. Finally, the strength design criteria of cement-stabilized loess subgrade were put forward based on railway subgrade durability by analyzing the obtained reduction coefficients and the critical dynamic strength of railway subgrade.

Design criteria for steel I columns under axial load and biaxial bending

1976 ◽  
Vol 3 (3) ◽  
pp. 466-473
Author(s):  
D. A. Ross ◽  
W. F. Chen
Keyword(s):  
Ultimate Strength ◽  
Axial Load ◽  
Bending Moment ◽  
Design Criteria ◽  
Biaxial Bending ◽  
Design Code ◽  
Simple Modification ◽  
Strength Design ◽  
Depth Ratio

The design code, Canadian Standard S16.1-1974, permits ultimate strength design steel H columns subjected to axial load and biaxial bending moment. However, this is permitted only for sections in which the flange width to section depth ratio is equal to or greater than 0.8. In this paper a simple modification to the previous formulas is proposed which enables the restriction on flange width to section depth ratio to be removed so that they are also applicable to steel I columns.

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