1-20 of 493 Search Results for

direct numerical methods

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540001
EISBN: 978-1-62708-309-6
... . The directions of the principal stresses can also be obtained from the Mohr’s circle. The angle DCA , labeled 2φ, is the double angle between one of the principal axes with respect to the axis of reference. The X -axis is usually taken as the reference axis. For the calculation of the numerical value...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040091
EISBN: 978-1-62708-300-3
... Abstract There are numerous approximate methods, both analytical and numerical, for analyzing forging processes. None are perfect because of the assumptions made to simplify the mathematical approach, but all have merit. This chapter discusses the slab, upperbound, and finite element methods...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540383
EISBN: 978-1-62708-309-6
... data requirements and solution times without sacrificing required accuracy. Numerous techniques have been proposed and are available in the literature. The statistic-based root mean square (rms) method, though not a cycle reduction/condensation routine, has proved effective in working with some random...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260029
EISBN: 978-1-62708-336-2
... an excellent study using numerical methods to calculate the nonsteady-state temperature distribution in extrusion through conical dies. They included the temperature dependencies of the flow stress and of the thermal constants of the billet and the tool materials into the analysis. The researchers considered...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040083
EISBN: 978-1-62708-300-3
... for a given problem. However, this method is time consuming and parameters cannot be identified accurately. Therefore, it is necessary to use a numerical optimization technique for robust determination of the parameters in the flow stress equation. Generally, the unknown parameters are determined...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500211
EISBN: 978-1-62708-317-1
... roll forming concepts such as flexible roll forming (FRF) ( Ref 10.14 ). Flexible roll forming enables roll forming of profiles with variable cross sections in the longitudinal direction. In this method, the forming rolls are not fixed in their position, as by the conventional roll forming...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2011
DOI: 10.31399/asm.tb.cfw.t52860035
EISBN: 978-1-62708-338-6
... the concave area, or apply some material at more favorable orientations by some other method, such as the local hand placement of fabric reinforcements. Fig. 4.6 Half-wound rocket casing showing constant positive curvature in the circumferential direction. Courtesy of Crescent Consultants Ltd...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260001
EISBN: 978-1-62708-336-2
... on the alloy and the method used. In hot extrusion, the billet is preheated to facilitate plastic deformation. Classification of Extrusion Processes The two basic types of extrusion are direct and indirect, which are commonly used in aluminum industries as shown in Fig. 1 and 6 . Solid and hollow...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720293
EISBN: 978-1-62708-305-8
... to the machinability of iron castings. Prevention is within the control of foundries. Differences in pattern size when using multipattern plates can be virtually eliminated by the use of computer aided design and manufacturing methods and computer numerical control machines in patternmaking. Better process control...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.htpa.t53310001
EISBN: 978-1-62708-346-1
... orders of magnitude, oriented to greatest possible simplicity of the method and should facilitate the calculation of the measurement uncertainty for a large circle of users. In contrast to this, the directives of EA are tailored to the needs of accredited calibration laboratories for the measurand...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2023
DOI: 10.31399/asm.tb.edfatr.t56090083
EISBN: 978-1-62708-462-8
... on the system-level interface stack to improve the quality of fault isolation (FI) is assessed to be an area of concern. The solid immersion lens (SIL) is evaluated to be a viable solution. This chapter reviews the overall SIL technology and the technical challenges. SIL, also well known as numerical aperture...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340143
EISBN: 978-1-62708-427-7
... and billet. The process can be done either by direct extrusion or indirect extrusion , as depicted in Fig. 7.4 . Direct extrusion is the most common method, where the billet is forced through the die orifice in the same direction as the ram pushing the billet ( Fig. 7.4a ). The other method, indirect...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040185
EISBN: 978-1-62708-300-3
... forging loads and stresses with acceptable engineering accuracy. Numerical methods: The finite-element method (FEM) is the most widely used method in this field. The major advantage of this method is its ability to generalize its applicability to various problems with little restriction on workpiece...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720411
EISBN: 978-1-62708-305-8
... be entrapped any number of places in the weld between passes. Slag inclusions are generally oriented along the direction of welding. Three methods used for the detection of slag below the surface of single-pass or multiple-pass welds are magnetic particle, radiographic, and ultrasonic inspection. Depending...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870105
EISBN: 978-1-62708-344-7
... methodologies that have been proposed in recent years, some of which are currently used in numerous engineering applications. For brevity, this discussion does not attempt to be complete; rather, it serves only to indicate some of the difficulties involved in the problem and how various methods have attempted...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2022
DOI: 10.31399/asm.tb.tstap.t56040101
EISBN: 978-1-62708-428-4
... and provides examples of the best practice confirmed by hundreds of tests performed worldwide, adopted by numerous industrial standards, and requested to comply with international technical standardization and certification organizations such ISO, AS, SAE, and Nadcap. bond strength bond testing thermal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320049
EISBN: 978-1-62708-332-4
... for the Von Mises criteria. As shown, the Von Mises criteria show a region that is nearly 15% larger than for the Tresca criteria, and the Von Mises criteria are preferred for designing ductile castings such as steel and ductile iron. 5.4.4 Finite Element Analysis The FEA is a numerical method...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720139
EISBN: 978-1-62708-305-8
... commonly encountered composition ranges, direct reading emission spectrometers are not useful for qualitative or quantitative analysis of broader ranges of samples. Instruments with Charge Coupled Device (CCD) Detectors Both of the previously described methods of detection are now being supplanted...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500051
EISBN: 978-1-62708-317-1
... is its robustness along with a higher computational speed and a lower memory requirement as compared to the static implicit method. The explicit approach also predicts wrinkles along the workpiece, which are initiated through numerical inaccuracies. The region where these wrinkles occur is quite...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870219
EISBN: 978-1-62708-299-0
... other characteristics, which can be tested by methods that do produce numerical data. If a correlation can be established between these other data and the corrosion results desired, then measurement of these other characteristics provides a quick lot-release tool providing high statistical confidence...