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Bracket - Fatigue Evaluation

The S-N curve, also called the Wöhler curve, is one of the most popular methods for fatigue evaluation. The curve relates stress amplitude to the limiting fatigue life and can be obtained directly from a set of standard fatigue test. Many times our applications are subjected to conditions different from the experimental conditions of the fatigue tests. The fatigue data must then be appropriately ...

Fatigue Analysis of a Wheel Rim

A fatigue analysis is performed on a wheel rim. The Findley fatigue criterion is examined. The submodeling technique is utilized performed a detailed study on the critical part of a spike. At first a study of the full model is made. The critical part is identified and a submodel is reanalyzed. The road load, which rotates around the wheel, is mapped from the analysis of the full model to the ...

Thermal Fatigue of a Surface Mount Resistor

A surface mount resistor is subjected to thermal cycling. The difference in the thermal expansion of different materials will introduce stresses in the structure. The solder which connects the resistor with the printed circuit board is seen as the weakest link in the assembly. It responds nonlinearly to changes in both temperature and time. In order to ensure the structural integrity of the ...

High-Cycle Fatigue of a Reciprocating Piston Engine

In a reciprocating piston engine the connecting rods transfer rotating motion into reciprocating motion. The connecting rods are constantly under high stresses and the load increases with the engine speed. A failure of one part in the engine usually results in a replacement of the whole engine. It is therefore of crucial importance to design all engine parts so that none of them will fail during ...

Rolling Contact Fatigue in a Linear Guide

When a linear guide is loaded above the manufacturer's specification limit, one concern is whether the contact loads will introduce fatigue spalling. In this system analysis, the entire guide has been analyzed and the mostly damaging contact load has been identified to occur on a rail raceway. Since spalling is initiated by a fatigue crack on the subsurface level, a fatigue evaluation based on ...

High-Cycle Fatigue Analysis of a Cylindrical Test Specimen

A benchmark model for the fatigue module. A cylindrical test is subjected to non-proportional loading. Three stress based models: Findley, Matake, Normal stress, are compared to analytical values and to each other. The non-smooth behavior of the Matake model is captured and discussed.

Energy-Based Thermal Fatigue Prediction in a Ball Grid Array

In a cooling system, a microelectronic component has been identified as the critical link. Since the power is repeatedly switched on and off, the component is subjected to thermal cycling. As a results a crack grows through a solder joint and disconnects the chip from the printed circuit board so that the component loses its operational functionality. The lifetime of the solder joints in two ...

Elastoplastic Low-Cycle Fatigue Analysis of Cylinder with a Hole

A load carrying component of a structure is subjected to multi-axial cyclic loading during which localized yielding of the material occurs. In this model you perform a low cycle fatigue analysis of the part based on the Smith-Watson-Topper (SWT) model. Due to localized yielding, you can use two methods to obtain the stress and strain distributions for the fatigue evaluation. The first method ...

Standing Contact Fatigue

A standing contact fatigue test is a procedure used for testing crack growth on the subsurface level. In such a test, a spherical object is pressed against the tested materials and cycled between a high and low compressive load. No translational movement between the two occurs. After a period of time, surface cracks can be observed on the flat object's surface, while further analysis of the ...

Fatigue Response of a Random Non-Proportional Load

A frame with a central cutout is subjected to a random load consisting of 1000 load events. The external load, recorded using three strain gauges, is simulated using superposition of three unit loads. The stress state around the cutout is obtained with the Rainflow cycle counting algorithm. The damage is estimated using the Palmgren-Miner linear damage rule.

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