GENERAL METHOD FOR CALCULATING BUTT AND ANGLE WELDS FOR STRENGTH

2021 ◽  
pp. 28-33
Author(s):  
Yu. N. Vavilov ◽  
I. Yu. Skobeleva ◽  
I. A. Shirshova
Keyword(s):  
Calculation Method ◽  
Calculation Scheme ◽  
Calculation Procedure ◽  
Fillet Welds ◽  
Specific Design ◽  
Strength Of Materials ◽  
Butt Welds ◽  
Strength Based ◽  
Design Solutions ◽  
General Method

The existing methods for calculating butt and fillet welds are private, developed for specific design solutions that do not take into account the variety of weld shapes and the variety of combinations of forces and moments. The article provides a general method for calculating butt and fillet welds for strength, based on the calculation method for nominal stresses, adopted in the strength of materials. This technique was used without any changes for the calculation of butt welds, since the weld is an extension of the part. The calculation of fillet welds is based on two assumptions, on the basis of which a calculation scheme has been developed, which makes it possible to use the calculation method for rated stresses. The article proposes two design schemes, considers the calculation procedure and derives two generalized strength conditions for the verification calculation of butt and fillet welds.

Design for Additive Manufacturing Inspired by TRIZ

2018 ◽  
Author(s):  
Jared Gross ◽  
Kijung Park ◽  
Gül E. Okudan Kremer
Keyword(s):  
Additive Manufacturing ◽  
Design Decision ◽  
Design For Additive Manufacturing ◽  
Specific Design ◽  
Innovative Design ◽  
Creative Solutions ◽  
Design Solutions ◽  
Manufacturing Techniques ◽  
Effective Design ◽  
Matrix Case

With the rise in popularity of additive manufacturing (AM), relevant design methodologies have become necessary for designers to reap the full benefits from this technology. TRIZ is a problem-solving tool developed to assist with innovative and creative solutions. This paper aims to create a new TRIZ matrix specifically developed for designers using additive manufacturing. The TRIZ matrix offers designers general innovative design solutions to improve specific features of a design while not sacrificing the effectiveness of other features. The proposed matrix can help effective design decision making for additive manufacturing in an early design process as well as a redesign process. Also, a design for additive manufacturing (DfAM) worksheet is provided to enable users to easily find specific design solutions for certain additive manufacturing techniques based on the general solutions derived by the TRIZ matrix. To illustrate the potential of this AM specific TRIZ matrix, case studies are presented.

Study on the Multi-Tooth Meshing Bending Strength for Involute Gear Drive with Small Tooth Number Difference

2014 ◽  
Vol 526 ◽  
pp. 236-241
Author(s):  
Xiao Ning Feng
Keyword(s):  
Calculation Method ◽  
Bending Strength ◽  
Gear Pair ◽  
Bending Stress ◽  
Strength Factor ◽  
Gear Drive ◽  
Small Tooth ◽  
Strength Based ◽  
Tooth Number ◽  
Internal Gear

This article has established numerous entity assembly models of internal gear pair with small tooth number difference of stub gear, then calculates the bending stress of multi-tooth meshing by means of FEM, determines bending strength factor of multi-tooth meshing, and forms the calculation method of bending strength based on influence by multi-tooth meshing.

scholarly journals Projective method for spinorial techniques: Unifying calculational schemes of Dirac amplitudes

2019 ◽  
Vol 65 (6 Nov-Dec) ◽  
pp. 639
Author(s):  
E. Sanchez ◽  
M. Moreno
Keyword(s):  
Standard Method ◽  
Calculation Procedure ◽  
Closure Property ◽  
Projective Method ◽  
Method Of Calculation ◽  
Dirac Particles ◽  
Massless Spinor ◽  
Dirac Spinors ◽  
General Method

There have been numerous approaches to the calculation of spin dependent amplitudes for Dirac particles. All of them have their own advantages, particularly, the standard method of calculation, based on the multiplication by the unit, has a few shortcomings. In this work we use the closure property of the Dirac spinors to present a general method for the amplitude computation. It is shown that the massless spinor method and the helicity spinor method can be formulated through this method. Finally, we get an example of this calculation procedure computing the spin dependentamplitude for the Compton process.

scholarly journals Consideration of soil strata heterogeneity influence on differential foundation settlements of overpasses for high-speed railways

2019 ◽  
Vol 265 ◽  
pp. 02003 ◽  
Author(s):  
Sergei Kudryavtsev ◽  
Vladimir Ulitskii ◽  
Sergei Alekseev ◽  
Stanislav Kondrat'ev
Keyword(s):  
Calculation Method ◽  
High Speed ◽  
Shallow Foundations ◽  
Foundation Soil ◽  
Ballastless Track ◽  
Soil Settlement ◽  
Design Solutions

The implementation of projects for the construction of high-speed railways actualizes the search of effective approaches to accounting the influence of soil strata heterogeneity along the course of the track on differential foundation settlements of overpasses. Russian special technical conditions prescribe sufficiently stringent regulation limits of absolute values of overpasses' foundation soil settlements (20 mm for ballastless track) and angles of break in profile (the differential foundation soil settlement), which should not exceed 1 ‰ for ballastless track. These requirements make it necessary to develop the calculation method, which is based on the criterion of deformation. To ensure compliance of design solutions to the specified regulations it is appropriate to use the method of the predefined equated soil settlements for design of shallow foundations of overpasses for high-speed railways. Several features of application of this method are presented in this article.

The strength of fillet welds under longitudinal and transverse shear: a paradox

1985 ◽  
Vol 12 (1) ◽  
pp. 226-231 ◽  
Author(s):  
D. J. Laurie Kennedy ◽  
Gary J. Kriviak
Keyword(s):  
Longitudinal Direction ◽  
Longitudinal Axis ◽  
Fillet Welds ◽  
Strength Analysis ◽  
Design Standards ◽  
Transverse Strength ◽  
Strength Based ◽  
Current Design ◽  
Longitudinal Strength ◽  
Vector Sum

Fillet welds loaded only by transverse forces exhibit considerably greater strength than those loaded only by longitudinal forces. Current design standards in North America generally base the strength on the minimum value obtained in the longitudinal direction and consider that the strength is independent of the direction of loading. These standards require as well, that fillet welds loaded simultaneously by both longitudinal and transverse components be designed such that the vector sum of the components does not exceed the longitudinal strength. Experimental data, although limited, indicate that this vector approach is very conservative. Some standards do allow an ultimate strength analysis, although the method is not given. The transverse strength of fillet welds is about 1.45 times the longitudinal strength, and for angles of loading of up to 45° from the longitudinal axis, welds with transverse components have longitudinal capacities in excess of the longitudinal strength. Based on available test data, two alternative interaction relationships are proposed for the design of fillet welds loaded simultaneously by longitudinal and transverse forces. Key words: connections, design, fillet welds, longitudinal strength, transverse strength, steel.

scholarly journals A Fast Identification Method of Yield Strength of Materials Based on Bending Experimental Data

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 169
Author(s):  
Yongchuan Duan ◽  
Le Tian ◽  
Fangfang Zhang ◽  
Haidi Qiao ◽  
Muyu Li ◽  
...  
Keyword(s):  
Experimental Data ◽  
Yield Strength ◽  
Average Error ◽  
Prediction Errors ◽  
Relevant Model ◽  
Strength Of Materials ◽  
Vector Method ◽  
Yield Load ◽  
Strength Based ◽  
The One

Identifying the yield strength of materials quickly and accurately is the key to realizing defect prediction and digital process control on the production line. This paper focuses on identifying the material yield strength based on bending deformation, analyzing the influence of different die fillets, punch fillets, and die spans on the curve shapes, determining the reasonable dimensions of the device, and developing them. Two methods for rapidly extracting the yield load are proposed—the window vector method (WV) and the fitting residual method (FR)—and compared with the double secant line method (CWA) and the one tenth thickness method (t/10). Because there is no direct correspondence between the yield load and the material performance parameters, the relevant equations were fitted using the experimental data. The linear correlation between load and yield strength determined by these four methods was close to 0.99. Finally, four kinds of sheets with high, medium and low yield strength were tested and compared with the observed results. The result shows that when the yield strength is small, the average error and the relevant model dispersion will increase. As the yield strength increases, the biases increase gradually. The prediction errors based on the t/10, WV, and FR methods were all below 4%.

AC-130U Gunship AFT-Scanner Ergonomic Review: Design Solutions for Program Office

1995 ◽  
Vol 39 (18) ◽  
pp. 1204-1208 ◽  
Author(s):  
David F. Wourms ◽  
Frank C. Gentner ◽  
Jennifer L. Farrell
Keyword(s):  
World War Ii ◽  
Information Analysis ◽  
World War ◽  
Specific Design ◽  
Special Operations ◽  
Analysis Center ◽  
Special Operations Forces ◽  
Design Solutions ◽  
Head Neck

Concerned about neck/back pain and diminished alertness attributed to awkwardness of AC-130U Spectre Gunship aft-scanner workstations, the Special Operations Forces Development System Office (SOF DSO) requested that the Crew System Ergonomics Information Analysis Center (CSERIAC) review the literature for design solutions. Aft-scanners recline face-down toward the aircraft's tail while leaning downward into a bubble window to detect launches of Surface-to-Air Missiles (SAMs). To scan territory below and to the sides of the Gunship, numerous head/neck movements are required. No neck/head rests exist to support the scanner during long missions over hostile territory. Diminished visual alertness can result from fatigue of maintaining the “unnatural” prone position. Long-term back and neck discomfort may follow. The comprehensive CSERIAC literature review verified adverse physiological effects and identified specific design solutions, including ones used during World War II flight tests. The DSO has already implemented several of these solutions and may implement additional solutions to increase mission effectiveness.

Human Factors Design considerations for Military Trains

1989 ◽  
Vol 33 (8) ◽  
pp. 536-540 ◽  
Author(s):  
Daniel McCrobie
Keyword(s):  
Human Factors ◽  
Design Criteria ◽  
Specific Design ◽  
Test Program ◽  
Research Project ◽  
Design Considerations ◽  
Usability Test ◽  
Design Solutions ◽  
Test Process

This report describes a research project to develop and verify habitability and human factors design criteria as applied to the design of a train rail car. A study of analogous conditions and similar environments was used to develop specific design solutions and design criteria for the rail cars. Verification of these design criteria was done via an iterative, usability test program with actual user personnel. The results of the first set of studies suggest that this test process improved the design of the system. The methods and results sections of this report contain specific design solutions and general comments that were developed during the test process.

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