Tensile strength testing

Although the USP defines the knot-pull tensile strength test in terms of a surgeon s knot, most surgeons use a variety of other knots depending on... 

Table 17 Summary of tensile strength test results for Sample 4 ...

The tensile strength test [Figure 3.1 (1)] (ASTM-638) employs samples of a specified shape, typically a dogbone, as depicted in Figure 3.2. The sample is clamped at one end and pulled at a constant rate of elongation until the center of the specimen fails. 

Tensile strength testing was performed using 0.05 wt% of selected experimental agents on dry cellulose. Testing results are provided in Table 1. 

TABLE 1. Critical Micelle Concentration and Tensile Strength Testing Results for Glyoxalated Poly(vinylamide-co-diallyldimethylanunonium chloride)... 

Rabino Massa, E., Masali, M., and Conti Fuhrman, A. M. (1980). Early Egyptian mummy hairs tensile strength tests, optical and scanning electron microscope observations A paelaeobiological research. /. Human Evol. 9,133-137. 

Tablet disintegration test, 36 Tensile strength testing...

Soil burial tests are important in the assessment of the degradation of a range of polymers by the corresponding microflora. They are performed either under field or laboratory conditions with the use of specific strains without the presence of any additional carbon source other than that supplied from the polymer (Whitney, 1996). There are certain drawbacks that should be taken into account, namely the lack of reproducibility due to the climatic conditions and the change of the microbial soil flora when in situ experiments are performed. However, in situ soil burial tests are often the most useful when the extent of biodegradability of a material is sought, especially when combined with tensile strength tests and microscopic examinations (Cain, 1992). 

Number of valid repetitions of the tensile strength test is in parentheses. 

Many aspects of this research will be pursued in future work. Half-life boundaries will be well defined so that "risk ratings may be given to historic cloth before specific conservation treatment is performed. Through the use of this methodology, prediction of the effects of the most commonly accepted treatments for specific textile degradation states may be possible so that only initial tensile strength testing may be necessary. 

Mechanical Testing. Tensile strength tests were performed with an Instron tensile tester as per the American Society for Testing and Materials (ASTM) D-1682, and tear testing was done with an Elmendorf apparatus as per ASTM D-1424 at 21 °C and 65% rh, after conditioning the specimens for at least 24 h. Results reported are the average of three tests. 

Although some of the bulk materials corresponding to the fibers are mechanically brittle, the strong reduction in volume faults enables the realization of fibers with an enormous increase in Young s (elasticity) modulus and tensile strain. The mechanical properties of several important reinforcing fibers obtained from tensile-strength tests are summarized in Fig. 5.2-1. 

Tensile strength testing is by far the most popular method of evaluating of filled materials. This can be seen from the numerous publications which analyze the subject. The information in this section is organized to provide the following information ... 

Evaluation of mechanical damage due to photo-oxldatlon was monitored by changes in low-temperature brittleness per ASTM D746 and by decrease In percent elongation as determined in a standard tensile strength test. Selected samples were examined for changes In bulk oxidative stability by thermal analysis where a specimen Is heated In an oxygen atmosphere and the time to onset of the exotherm due to oxidation measured. 

It follows, therefore, that the tensile strength tests reported in section 4.5 should also be included in this section, as a direct way of measuring cohesion. All of the other ways are, therefore, indirect in that they measure other properties related to or as a consequence of the internal cohesion forces. 

Table 3 gives the comparison between Resin B (enzyme-catalyzed product) and the chemical counterpart. The tensile strength test also shows comparable values between the enzymatic and the chemical products. The wet tensile strength of both resins also increases after curing. 

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