Purpose

Parachutes are equipment that is repeatedly used as and when needed. Some of them are used for as many as 60 jumps. The property of the canopy fabric gets deteriorated with use. It is evaluated by destructive tensile and bursting strength. This study aims to focus on the nondestructive evaluation of the canopy fabric's fitness by testing air permeability and relating it with bursting strength. Predictor equations were developed to determine bursting strength from air permeability values.

Design/methodology/approach

ANOVA techniques and statistical regression equations were formed.

Findings

A series of samples containing five parachutes fabrics was used seven times, and their air permeability and bursting strength were determined to find the extent to the effect of reuse of parachute fabrics on their bursting strength and air permeability determination. It was found that there was a progressive drop in bursting strength and an increase in air permeability. An investigation of the extent of determination in terms of bursting strength and an increase in air permeability following the sense of five different types of parachute fabrics is reported.

Research limitations/implications

The work focuses on the prediction of bursting strength to textile materials only and may not apply to other materials like membranes and sheets. The process of determining air permeability is relatively simpler and faster.

Practical implications

The bursting strength can be predicted for used parachutes, which are otherwise subjected to destructive testing.

Social implications

The men using the parachutes can be assured of the superior flawless performance of the parachute as equipment and also contribute to the saving of resources due to nondestructive testing, 100% evaluation of all parachutes is possible.

Originality/value

This article describes the nature of the test procedure and discusses the means of introducing it to users of parachutes. It is accepted that the method must undergo field evaluation and possible modification before it can become a routine tool of parachute using organizations.

中文翻译：

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尼龙降落伞织物顶破强力预测

目的

降落伞是在需要时重复使用的设备。其中一些用于多达 60 次跳跃。天篷织物的性能随着使用而变差。它是通过破坏性拉伸强度和爆破强度来评估的。本研究旨在通过测试透气性并将其与爆破强度相关联，重点对顶篷织物的适用性进行无损评估。开发了预测方程来根据透气性值确定爆破强度。

设计/方法/方法

形成了方差分析技术和统计回归方程。

发现

一系列含有五种降落伞织物的样品被使用七次，测定它们的透气性和爆破强度，以找出降落伞织物重复使用对其爆破强度和透气性测定的影响程度。发现爆破强度逐渐下降，透气性增加。据报道，根据五种不同类型的降落伞织物的感觉，对爆破强度和透气性增加的测定程度进行了调查。

研究限制/影响

该工作仅侧重于预测纺织材料的爆破强度，可能不适用于其他材料，如膜和片材。确定透气性的过程相对简单和快捷。

实际影响

可以预测使用过的降落伞的爆破强度，否则这些降落伞会受到破坏性测试。

社会影响

使用降落伞的人可以确保降落伞作为设备的卓越无瑕性能，并且由于无损检测有助于节省资源，可以对所有降落伞进行 100% 评估。

原创性/价值

本文描述了测试程序的性质，并讨论了将其介绍给降落伞用户的方法。公认的是，该方法必须经过现场评估和可能的修改，才能成为降落伞使用组织的常规工具。