 |
| Title | A study of parachute seam design criteria. Part I, Investigation of the strength of nylon and rayon cloth seams |
| Alternative Title | Investigation of the strength of nylon and rayon seams |
| Series | WADC technical report no. 56-313, pt. I.;ASTIA document no. AD 110407. |
| Creator | Copland, Myron J.
Wright Air Development Center
Fabric Research Laboratories, Inc.
|
| Subject | Parachutes -- Materials -- Testing. Parachutes -- Rigging -- Testing. Seams (Sewing) -- Testing. Strength of materials Strains and stresses -- Testing.
|
| Description | The strength of parachute canopy seams was determined for a wide range of specification fabrics. The effect of variation in stitch type, thread size, number of rows of stitches, tape reinforcing and stitches per inch was studied. Tests were performed both on orthogonally and bias sewn samples. A new sample preparation and testing technique was developed which is believed to characterize seam efficiency more realistically than the current specification test. An important observation made was that similar seams sewn in different lots of fabrics of the same MIL Specification frequently exhibited rather wide variations in strength efficiencies. Of the controlled variables studied, rows of stitches, stitch type and stitches per inch had the greatest influence on seam strength. So-called ""production run"" seams were in almost all cases inferior to the ""best"" seam that could be made. A mechanistic and semi-quantitative interpretation of the factors controlling seam efficiency was developed and it is indicated that certain intrinsic fabric characteristics, in inter-action with the seam construction, may be important in determining the ultimate strength yield at the joint. |
| Publisher | Wright-Patterson Air Force Base, Ohio : United States Air Force, Air Research and Development Command, Wright Air Development Center, 1956. |
| Local Notes | Donated by the Deutsches Zentrum für Luft- und Raumfahrt e.V. Institut für Flugsystemtechnik, April 2000. |
| Notes | This work is part of the library's ""Parachute History Collection"", donated by the Deutsches Zentrum für Luft- und Raumfahrt e.V. Institut für Flugsystemtechnik, through the American Institute of Aeronautics and Astronautics Aerodynamic Deceleration Systems Technical Committee. ""WADC Technical Report 56-313 Part I""--T.p. ""ASTIA Document No. AD 110407""--T.p. ""June 1956""--T.p. ""Carpenter Litho & Prtg. Co., Springfield, O. 100 - November 1956""--T.p. Photocopy. Dayton, Ohio : Armed Services Technical Information Agency. Reproduced by Document Service Center. Fabric Research Laboratories, Inc. AF 33(616)-2807 |
| DateOriginal | 1956 |
| Format | Portable Document Format |
| Extent | 117 p. |
| Call Number | TL753 .C66 1956 |
| Original Record Link | http://leonardo.lindahall.org/ipac20/ipac.jsp?profile=lhlopen&full=3100001~!555874~!3 |
| Language | English |
| Relation | A study of parachute seam design criteria. Part I, Investigation of the strength of nylon and rayon cloth seams |
| Collection | Parachute History Collection |
| Rights | http://www.lindahall.org/collections/hos_imageuse.shtml |
