Tension coupon test

Output from the strain gages is in volts given by  

2bh zn - S22) where P = tensile force b = specimen width h = specimen thickness Ell = axial strain 22 = transverse strain 

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Figure 17.50 shows the [ 45] s tension coupon test (ASTM D 3518), where the shear strain is measured at 45° to the axis using strain gages where ... 

Turning now to tests on bolted joints in tension, the test set-up is straightforward and similar to tension coupon testing, but with the addition... 

Further details of all of the coupon tests (tension, compression and shear), including load-strain plots are given in reference 5. 

The advantage of including the adhesive s non-linear constitutive stress-strain model, in terms of the accuracy of the FE stress predictions, can be clearly demonstrated with reference to Fig. 10.16. This figure represents the stress-strain curve for a specific resin (i.e. Araldite 420 epoxy) bulk coupon tested experimentally in direct tension inside an environmental chamber where the temperature of the coupon reached 0°C. Path OAB represents the actual measured nominal stress-strain curve, which is characterized by two parts the first part (i.e. OA) is linear, whereas the second part (AB)... 

Load versus strain responses obtained from tests on coupons cut out of a 203 x 203 x 9.5 mm WF profile (a) longitudinal flange coupon tested in tension (b) transverse web coupon tested in compression. 

Mechanical Property Testing. Mechanical tests were performed on both unirradiated and irradiated materials at -157°C, 24°C, and 121°C. Specimens were kept dry prior to testing in an environmental chamber mounted in a tensile testing machine. Tensile test specimens of [0]4, [10]4, [45]4, and [90]4 laminates were cut from 4-ply composite panels. All specimens were straight-sided coupons. For tension and shear tests the length/width aspect ratio was 8. For the compression tests the aspect ratio was 0.25 and the unsupported length was 0.64 cm. The [0]4 laminates were used to measure the ultimate tension and compression strength, Xit the axial... 

Distribution of SZ Mechanical Properties after FSP. Because microstructures vary significantly with location, a miniature sheet-type tension test coupon design was developed to evaluate the distributions of strength and ductility... 

Tensile strength, Tensile strength is evaluated by pull testing on metal lap-shear coupons, most often aluminum. The standard test method is ASTM D1002, Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal) Alumi-... 

In order to predict the deformations in a simple statically loaded portal frame by means of frame analysis, it is necessary to know the stiffness of the beam and columns. These stiffnesses may be determined by measuring the material properties of coupons cut from the WF-section and combining them with nominal values of the section cross-sectional area and second moment of area. Accordingly, a series of tension, compression and shear tests on coupons cut from the flanges and web of the WF-section material was carried out. 

A variety of specimen shapes and sizes can be used but the most common is a smooth-bar tensile coupon, as described in ASTM E 8, Test Method for Tension Testing of Metallic Materials." In smooth-bar tests, the changes are measured in terms of time to failure, ductility (elongation or reduction-in-area), maximum load achieved, and area bounded by a nominal stress-elongation curve or a true stress/ true strain curve, which are often supported by fractogra-phic examination. The specimen is exposed to the environment while it is stressed under a constant displacement rate. 

The fiber-bundle pull-out method [19] is similar to the single-fiber pull-out method except that instead of using a single fiber, a bundle of fibers is used. A coupon is fabricated in which a bundle of fibers or a lamina of unidirectional fibers is cast in a block of matrix. Transverse notches are cut into the coupon near the end of the fiber bundle. The coupon is loaded in tension with the load applied parallel to the fiber axes. The load versus displacement curve can be monitored and the debonding point detected. In a similar manner to the way data are reduced for the single-fiber pull-out test, the interfacial shear strength between the bundle of fibers and matrix can be calculated. 

Coupons through compression and tension/compression fatigue testing. Spars by fatigue testing in flapwise mode. 

Surface-tension Test —The tombstoning performance of solder pastes has been speculated to be related to the surface tension of respective solder alloys. In this study, a wetting balance was used to measure the surface tension of solder alloys following established conditions. A piece of alumina coupon with a dimension of 2.5 X 0.4 X 0.062 cm was used for the testing. The solder pot was maintained at 245°C for the SnPb alloy and 260°C for SnAgCu alloys. The measured force with respect to time was translated to a graph of force vs. dip depth based on dip speed. When the alumina piece immersed into the solder for a certain depth where the meniscus became stable, the measured force was proportional to the displaced volume of solder. This force may be described as follows ... 

To understand the effect of stress concentration of SiC/SiC composites, several coupons with different notch geometries were tested in tension. The geometries tested include double-radius (DR), double-slit (DS) and standard dogbone (DB), and are own schematically in Figure 1, where the dimensions shown in parenthesis indicate width from notch tip to notch tip (net width). Damage initiation and progression was monitored by modal acoustic emission and a finite element analysis was also performed to compare experimraital data with that of a semi-analytic model. 

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