Numerical stress analysis of resin cracking in LSI plastic packages under temperature cyclic loading. II. Using alloy 42 as leadframe material

1997 ◽  
Vol 20 (2) ◽  
pp. 176-183 ◽  
Author(s):  
T. Saitoh ◽  
M. Toya
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Plastic Packages

Elasto-plastic contact stress analysis of joints subjected to cyclic loading

1996 ◽  
Vol 60 (6) ◽  
pp. 1067-1077 ◽  
Author(s):  
K.Satish Kumar ◽  
B. Dattaguru ◽  
T.S. Ramamurthy ◽  
K.N. Raju
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Contact Stress

scholarly journals Time-Resolved X-Ray Stress Analysis by Single Exposure Technique during Cyclic Loading.

1991 ◽  
Vol 40 (454) ◽  
pp. 825-831 ◽  
Author(s):  
Shin-ichi OHYA ◽  
Shozaburo OHTA ◽  
Ken-ichi HASEGAWA ◽  
Shigekazu MISONO
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Single Exposure ◽  
Time Resolved ◽  
X Ray ◽  
Exposure Technique

Dynamic Cyclic Stress Analysis of Rolling of a Diametrically Loaded Helical Test Specimen

2017 ◽  
Author(s):  
Don Metzger ◽  
Mark Paulseth ◽  
Andre Gagnon
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Test Specimen ◽  
Three Dimensional ◽  
Cyclic Stress ◽  
Fatigue Analysis ◽  
Rolling Motion ◽  
Structural Components ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In a particular nuclear application, separation between structural components is maintained by a helical spring such that the separating load bears across the diameter of the spring coils. Relative motion between the structural components due to changing load and temperature is accommodated by rolling of the spring. This rolling motion while under radial load results in cyclic loading of the spring material. Fatigue analysis of the cyclic loading must take into consideration the material degradation due to the unique operating environment, so testing of ex-service material is required. Standard fatigue test specimens are not possible due to the small dimensions of the spring component, so cyclic stress is applied to the material via a reciprocating rolling motion between two platens. Stress analysis of this arrangement provides the stress range and mean stress necessary for fatigue analysis. A three dimensional finite element dynamic simulation of the test process is applied to a nominal test specimen to determine detailed history of the stress distribution. Numerical challenges are addressed to ensure representative loading conditions are properly applied, and that steady-state response is achieved. Bounding stress ranges are determined, and the implications of the results in fatigue analysis are discussed. It is concluded that response at the ends of the specimens is important in properly evaluating test data.

Paper 13: Creep Deformation and Fatigue Failure of Structural Materials

1969 ◽  
Vol 184 (2) ◽  
pp. 95-100
Author(s):  
B. J. L. Darlaston
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Creep Deformation ◽  
Laboratory Tests ◽  
Previous History ◽  
Material Behaviour ◽  
Considerable Effort ◽  
Cyclic Temperature ◽  
History Of ◽  
Behaviour Models

In support of the vast amount of stress analysis work on components, considerable effort is required to provide suitable materials behaviour models. Simple laboratory tests on uniaxially loaded specimens under constant temperature condition provide the bulk of data, but methods are required to translate these data to multiaxial conditions with non-uniform cyclic loading and cyclic temperature. The material behaviour laws, therefore, are aimed at meeting two requirements: first, to predict the deformamation response in terms of the imposed loading conditions and the previous history of the material; and second, to analyse the stress or strain cycles to predict failure. This paper reviews the steps being taken at Berkeley Nuclear Laboratories, C.E.G.B., and elsewhere to achieve these two objectives.

Thermoelastic Stress Analysis of T-Stub Model

2011 ◽  
Vol 70 ◽  
pp. 464-469 ◽  
Author(s):  
D. Carazo Alvarez ◽  
M. Haq ◽  
J.D. Carazo Alvarez ◽  
Eann A Patterson
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Stress Analysis ◽  
Thermoelastic Stress ◽  
Contact Forces ◽  
Plastic Behavior ◽  
Fe Model ◽  
Thermoelastic Stress Analysis ◽  
Joint Models ◽  
Eurocode 3

Thermoelastic Stress Analysis (TSA) has been used to obtain the stress field in bolted T-Stub joint models (as defined by Eurocode 3) subject to cyclic loading which were employed to validate a Finite Element (FE) model. It was concluded from the results of the experiments and modeling that the behavior of the T-Stub is more complex than claimed by Eurocode due to contact forces, bolt interaction and plastic behavior.

On the Stress Analysis of Creeping Structures Subject to Variable Loading

1973 ◽  
Vol 40 (2) ◽  
pp. 589-594 ◽  
Author(s):  
A. R. S. Ponter
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Cycle Time ◽  
Characteristic Time ◽  
Variable Loading ◽  
Viscous Material ◽  
Perfectly Plastic ◽  
Worked Example ◽  
Optimal Bounds ◽  
Elastic Perfectly Plastic

In earlier papers [13, 14] displacement and deformation bounds were derived for a structure composed of an elastic, perfectly plastic, time-hardening viscous material. Here the upper and lower work bounds are discussed for a body subject to cyclic loading. It is shown that the optimal bounds may be interpreted as the asymptotic states when the cycle time is very small and very large compared with a characteristic time of the material. The time scales which occur in practice are discussed, and a simple worked example is presented.

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