ASTM D1683 PDF

These four seam engineering variables contribute to a textile product being able to achieve the maximum sewn seam strength performance and structural integrity when cut pieces of fabric are joined together. For example: an inflatable restraint in an automobile. Once deployed, it must be replaced; it cannot be re-used. Likewise, there are other textile structures, intended to be used multiple times, while also being subjected to various care and maintenance regimens.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. NOTE 1—The grab test procedure in Test Method D shall be used to determine any characteristic in fabric that can affect the measurement of sewn seam strength.

NOTE 2—This test method is used in conjunction with Test Method D , which is used to measure breaking force and elongation of textile fabrics. Sewn seams in woven fabrics can fail due to rupture, slippage, or any combination thereof. Rupture can be further categorized as failure or fabric, or sewing thread, or seam slippage.

Terminology 3. Seam slippage, occurs when fabric yarns parallel to the stitch line move away 1. The values expressed in each system may not be exact equivalents; therefore each system must be used independently of the other, without combining values in any way.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents 2. Current edition approved March 1, Published April Originally approved in Discontinued in and reinstated in as D — Metric 90 0. Metric 0. It is caused by the yarns in the fabric pulling out from the stitch line, and manifests itself as a gaping opening.

Any movement of the warp and weft yarns away from a seam line under transverse stresses, which exacerbate the potential damage. See yarn slippage. Summary of Test Method 4. Additionally, the seam strengths of different fabrics can be compared directly by using one of the standard seam assemblies speci?

Because current information about laboratory precision is incomplete, comparative tests may be advisable. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens from the same lot of fabric to be evaluated, which utilize a like seam assembly or standard seam assembly.

The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. If a bias is found, either its cause must be determined and corrected, or the purchaser and supplier must agree to interpret future test results in light of the known bias. Because seam efficiency varies with each fabric, one of the standard seam assemblies, as noted in Table 1, should be used when comparing the seam strength of different fabrics.

Table 1 lists the default seam assembly speci? If a determination cannot be made as to which seam is the best suited for a particular fabric, all should be evaluated. See Note 2. NOTE 3—If competent factory sewing operators are not accessible, a laboratory technician familiar with the potential for damage of an improperly sewn seam may prepare the seamed test specimens. While the ultimate consequence of this phenomenon is rupture, seam slippage greater than either the values stated in customer speci?

An example of a commonly used seam slippage value is 6 mm [0. Apparatus 6. See Note 4. Because of the biases between test results for these types of tensile testing machine, report the name, type and date of calibration of the machine used.

See Note 5. NOTE 5—Front or top faces measuring 25 by 50 mm 1. For many materials, the former are preferable because of the larger gripping area which tends to reduce slippage. While both sizes of gripping surface are permitted, the face sizes used must be the same for all samples in the test and must be recorded in the report. Sampling Manufactured Items 7.

See Note 6. NOTE 6—An adequate speci? The breaking force of the seam and fabric will permit determination of seam efficiency. This test method can aid in determining optimum seam interaction for any given fabric by comparing the properties of the fabric with and without seams. If more than one type of seam assembly exists in the laboratory samples, the choice of seam assembly to be evaluated must be agreed upon by the purchaser and supplier.

Cut each specimen to a total length of mm 14 in. See Fig. If the required number of specimens cannot be cut from each laboratory sampling unit or if there is more than one seam in the laboratory sampling units, modify the sampling plan as agreed between the supplier and purchaser. See Note 7. NOTE 7—When the specimen length of mm 14 in. A comparison of the fabric break strength as determined by Test Method D , of the two fabric swatches used in the seaming to the sewn strength of the seam assembly is required to produce a value indicative of the seam efficiency.

Sampling of Seams Prepared from Fabric 8. Preferably specimens for a given fabric direction should be spaced along a diagonal of the fabric to allow for representation of different warp and?

When possible,? Unless otherwise speci? Depending on the direction in which seam strength is to be tested, sew swatch as follows: 8. Sew a seam as agreed upon by purchaser and supplier Note 8. NOTE 8—In the absence of an agreement on the construction of a seam assembly, prepare a standard seam using the speci? These seam assembly speci? These default seam assemblies are to be used when production seams are not available, or speci? Heavy fabrics or fabric blends may require a longer period of conditioning time to reach moisture equilibrium.

Fiber Animal? The test specimen should contain a seam approximately mm 4 in. Each test specimen will contain sufficient material for one seamed and one fabric test. See Note 9 NOTE 9—When preparing sewn seams to be evaluated for failure, it is suggested that distinct colors of sewing thread be used to easily identify warp,?

Conditioning 9. Equilibrium is considered to have been reached when the increase in mass of the specimen in successive weighings Procedure For matched top and bottom jaws of equal width, measuring from the edge to perpendicular lines drawn on the specimen can ensure proper placement in the clamps.

Place the pen of the recording device on the zero ordinate and any convenient abscissa, start the tensile testing machine and continue the procedure until the sewn seam or fabric ruptures.

Stop the machine and reset to the initial start position. See Note 10 for computerized software program information. NOTE 10—Computerized software programs are available from various tensile testing equipment manufacturers. There are several options available to check for clamp slippage, an example of which follows: Distinction between clamp slippage and fabric slippage within the specimen can be determined by measuring the elongation of the intermediate space between the upper and lower limits of the clamp gage area.

If the time of break for these specimens is within 20 6 3 s, do not determine the time of break for the remaining specimens and do not report the average time of break. If the time of break for the? Record and report separately the test results in either warp or? The pen of the recording device must be placed on the same zero ordinate and abscissa as used to test the corresponding sewn seam. The decision to discard the results of any failing specimen must be agreed to between purchaser D — 04 FIG.

In the absence of any such agreement, these specimens and results shall be retained. When a determination is signi? The reason for disregarding this determination must be reported.

If any of these modi? Calculation See Note Recorders may exhibit distinct ratios of actual magni? Report Describe the material or product being sampled and the method of sampling used. Precision and Bias Preliminary intralaboratory testing data has been completed and is attached.

Keywords Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

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More D These four seam engineering variables contribute to a textile product being able to achieve the maximum sewn seam strength performance and structural integrity when cut pieces of fabric are joined together. For example: an inflatable restraint in an automobile. Once deployed, it must be replaced; it cannot be re-used. Likewise, there are other textile structures, intended to be used multiple times, while also being subjected to various care and maintenance regimens. When the failure results in displacement of yarns, the textile product will need to be replaced.

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Astm d1683 PDF

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. NOTE 1—The grab test procedure in Test Method D shall be used to determine any characteristic in fabric that can affect the measurement of sewn seam strength.

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ASTM D1683 Fabric Seam Strength Testing

Seams are used to stitch two different pieces of fabric together. Most seams are made with a sewing machine, after the fabric has been woven and then cut. The specimen is pulled in tension, similar to a grab test, until it breaks. Geometry: This ASTM test requires Vise Grips to be used, however in some rare cases, wrap grips can also be used however this should be noted on the test. This test requires specialized grip jaws inserts.

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