Impact of damage to residual strength of high strength synthetic fiber rope in forestry operations

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  • 林業用高強度合成繊維ロープの損傷程度と残存強度
  • リンギョウヨウ コウキョウド ゴウセイ センイ ロープ ノ ソンショウ テイド ト ザンソン キョウド

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Abstract

<p>High strength synthetic fiber ropes used in forestry operations are vulnerable to abrasion damage. It is necessary to understand the relationship between damage and remaining rope strength to judge the appropriate timing of replacement. We tested a high strength synthetic fiber rope (10 mm diameter, 12 strands) with eight damage treatments and severities, including a control and a different type of terminal treatment with no damage, each replicated three times. The standard terminal treatment was a simplified eye splicing method in which the rope end was inserted into 10 pairs of picks within the standing rope body without burying it. An alternative terminal treatment buried the end of the rope: it had greater strength than the control although the difference was not significant. No significant differences were observed in residual rope strength between the two grinding discs (hard and soft) used to abrade ropes. However, one deep abrasion treatment with the soft grinding disc resulted in dramatically reduced rope strength. No significant difference was observed between the two- and four-cut strand treatments, or the surface abrasion treatments. The breaking strength of rope as a function of its effective section area was significantly reduced in the deep abrasion treatments, possibly as a result of heat generated during the grinding process.</p>

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