Advanced Methods of Fatigue Assessment by Dieter Radaj, Michael Vormwald

By Dieter Radaj, Michael Vormwald

In 5 chapters, this quantity provides contemporary advancements in fatigue overview. within the first bankruptcy, a generalized Neuber notion of fictitious notch rounding is gifted the place the microstructural aid components rely on the notch establishing perspective in addition to the loading mode. the second one bankruptcy specifies the notch tension issue together with the stress power density and J-integral suggestion whereas the SED procedure is utilized to universal fillet welded joints and to thin-sheet lap welded joints within the 3rd bankruptcy. The forth bankruptcy analyses elastic-plastic deformations within the close to crack tip quarter and discusses motive force parameters. The final bankruptcy discusses thermomechanical fatigue, rigidity, and pressure levels.

Show description

Read or Download Advanced Methods of Fatigue Assessment PDF

Best products books

Topology Optimization, Edition: 2nd

Initially released with the name Optimization of Structural Topology, form, and fabric. The topology optimization approach solves the elemental engineering challenge of dispensing a restricted quantity of fabric in a layout area. the 1st variation of this booklet has turn into the traditional textual content on optimum layout that's concerned about the optimization of structural topology, form and fabric.

Advanced Man-Machine Interaction: Fundamentals and Implementation (Signals and Communication Technology)

Modern man-machine interfaces are more and more characterised by way of multimodality, nonintrusiveness, context-sensitivity, adaptivity, and teleoperability. The implementation of such houses depends on novel innovations in felds comparable to, e. g. , computing device imaginative and prescient, speech know-how, trainable classifiers, robotics, and digital fact.

MRP II: Planning for Manufacturing Excellence (Chapman & Hall Materials Management/Logistics Series)

MRP II explores the foundations of MRP II platforms, and the way the producer can make the most of and institute them successfully for optimum revenue. The e-book will function a useful expert reference for brands instituting or using an MRP II scheduling process. it's going to even be a worthy instructing software for the two- and four- yr university or college courses, a reference for APICS certification overview, and carrying on with teaching programs.

Principles of Public and Private Infrastructure Delivery (Infrastructure Systems: Delivery and Finance)

Necessary to somebody fascinated by the making plans, layout, building, operation, or finance of infrastructure resources, this cutting edge paintings places venture supply, finance, and operation jointly in a pragmatic new formula of ways private and non-private proprietors can higher deal with their complete selection of infrastructure amenities.

Additional resources for Advanced Methods of Fatigue Assessment

Example text

Comparing the maximum stresses in mode 2 and mode 1 (Eq. 8 Limit Value Formulae for the Mode Two Stress Intensity Factor The stress intensity factor KII can be determined from a slender comparison notch (elliptical, parabolic, hyperbolic, keyhole or U-shaped) as the limit value of the maximum notch stress times the square root on the notch radius q when the latter becomes smaller and smaller (q ? 0 equivalent to q/a ( 1 or q/b ( 1). Based on the equations above for js and jr0 ; the following relationships, valid as limit value formulae, can be used: Elliptical (internal) notch: pffiffiffiffiffiffi KII ¼ 2:5981smax pq; pffiffiffiffiffiffi KII ¼ 1:0r0max pq ð1:90Þ pffiffiffiffiffiffi KII ¼ 1:4142r0max pq ð1:91Þ pffiffiffiffiffiffi KII ¼ 1:5708r0max pq ð1:92Þ pffiffiffiffiffiffi KII ¼ 0:3489r0max pq ð1:93Þ Parabolic (external) notch: pffiffiffiffiffiffi KII ¼ 3:6742smax pq; Hyperbolic (external) notch: pffiffiffiffiffiffi KII ¼ 4:0816smax pq; Keyhole (internal) notch: pffiffiffiffiffiffi KII ¼ 1:4021smax pq; U-shaped (internal) notch (FE analysis by F.

Summarising the numerical results, the following trends have been found for the support factor in the case of out-of-plane shear loading: • the factor s depends on the real radius q, starting with lower values for q = 0, but converging to a plateau value for q [ qà ; 34 1 Generalised Neuber Concept of Fictitious Notch Rounding Fig. 18 Geometry and dimensions of the V-notch specimen considered in the FE analyses, torsional loaded round bar with circumferential V-notch, q = 0 compared with q = qf; the nominal stresses sÃng relating to the gross cross-sectional area; (Berto et al.

By considering different failure criteria combined with plane stress and plane strain conditions, respectively, a comparison has been carried out between the effective stress concentration factor K t given by Eq. 29) and the stress concentration factor Kt(qf) evaluated with fictitious notch rounding, Eq. 30), modified by j. In both cases, the stresses in the specimens are obtained from the FE analysis. The first step is to evaluate Eq. 29), considering the normal or equivalent stress obtained by FE analysis along the bisector of the pointed V-notch.

Download PDF sample

Rated 4.33 of 5 – based on 22 votes