Advanced Micro Shear Testing for Solder Alloy Using Direct Local Measurement

2003 International Electronic Packaging Technical Conference and Exhibition, Volume 2 ◽

10.1115/ipack2003-35325 ◽

2003 ◽

Cited By ~ 2

Author(s):

Soonwook Kwon ◽

Yuri Lee ◽

Bongtae Han

Keyword(s):

Fem Analysis ◽

Test Configuration ◽

Stress Studies ◽

Lap Shear ◽

Lap Shear Test ◽

Geometrical Constraints ◽

Accuracy Of Measurement ◽

Electronic Assemblies ◽

Auxiliary Device

A modified single lap shear test configuration, based on the Iosipescu geometry, is proposed for determination of the constitutive properties of solder alloys. An auxiliary device (extension unit) is introduced to improve the accuracy of measurement. The extension unit is attached directly to the specimen and it converts shear displacements to axial displacements, which are subsequently captured by a high-resolution extensometer. With aid of the extension unit, shear deformations are measured without compensating machine and grip compliance. The specimen configuration includes geometrical constraints at the solder/substrate interfaces in most electronic assemblies. Consequently, the results represent pseudo-continuum properties that take account for grain constraints at the solder/pad interface. They are properties that are more realistic for continuum mechanics based stress studies such as an FEM analysis.

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Determination of Shear Strength and Failure Type of the Sealant using Lap Shear Test

Materials Today Proceedings ◽

10.1016/j.matpr.2018.01.061 ◽

2018 ◽

Vol 5 (1) ◽

pp. 2752-2758

Author(s):

Nikhil Kagalkar ◽

S. Srinivas ◽

B.R. Dhananjaya

Keyword(s):

Shear Strength ◽

Shear Test ◽

Failure Type ◽

Lap Shear ◽

Lap Shear Test

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Fatigue and Stress Studies: An Improved Semi-automated Procedure for Fluorometric Determination of Plasma Catecholamines

PsycEXTRA Dataset ◽

10.1037/e735732011-001 ◽

1966 ◽

Author(s):

Vincent Fiorica

Keyword(s):

Plasma Catecholamines ◽

Fluorometric Determination ◽

Stress Studies

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SERUM TRIIODOTHYRONINE DETERMINATION BY SATURATION ANALYSIS

Acta Endocrinologica ◽

10.1530/acta.0.0720714 ◽

1973 ◽

Vol 72 (4) ◽

pp. 714-726 ◽

Cited By ~ 3

Author(s):

A. Burger ◽

B. Miller ◽

C. Sakoloff ◽

M. B. Vallotton

Keyword(s):

Ionic Strength ◽

Limit Of Detection ◽

Improved Method ◽

Accuracy Of Measurement ◽

Tracer Amount ◽

The Mean ◽

Physiological Values ◽

Hyperthyroid Patients ◽

Solvent Blank

ABSTRACT An improved method for the determination of serum triiodothyronine (T3) has been developed. After addition of a tracer amount of the hormone, T3 was extracted from 1 ml serum under conditions of pH and ionic strength which favoured T3 extraction (89%) over thyroxine (T4) extraction (58%). Chromatography of the extracted material on Sephadex LH-20 separated T3 completely from residual T4. The T3 eluate was dried, then re-dissolved in 0.5 ml NaOH 0.04 n. To 0.2 ml duplicate aliquots, a standard amount of TBG was added for the competitive protein analysis. After one hour incubation at 4°C, separation of bound from free T3 was achieved on small Sephadex G-25 columns. Overall recovery was 67 ± 10.8% and correction for the loss was made. The solvent blank was 37 ± 27 (sd) ng/100 ml. Accuracy of measurement of known quantities of T3 added to serum was 98.4%. The coefficient of variation within the assay was 6.2% and between the assays it was 11.4%. The limit of detection (0.1 ng) corresponded to a concentration of 25 ng/100 ml. T4 added to serum did not interfere with T3 determination until high non-physiological values were reached. The mean ± sd serum T3 in 54 euthyroid subjects was 153 ± 58 ng/100 ml and in 24 hyperthyroid patients it was 428 ±186 ng/100 ml; 4 out of the 24 hyperthyroid values were within 2 sd of the mean euthyroid group. All the values found in the euthyroid group were well above the limit of detection of the method.

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