Geometric Parameters Influence on the Screw Withdrawal Strength of Coir Agglomerates

ABSTRACT

This study aims to evaluate the screw withdrawal behavior of agglomerated panels fabricated with coir fibers and a polyurethane resin as binder. Based on design of experiments, an analysis was conducted to understand and describe the withdrawal behavior by evaluating the main parameters that affect panel/screw interaction. Using Box–Behnken method, the maximum withdrawal strength was predicted by a second-degree response model with good approximation. The model presented the optimum combination of the main parameters that govern panel/screw interaction, namely: screw nominal diameter, pilot hole diameter and screw depth of penetration. The latter showed the greatest contribution to withdrawal strength.

摨要

本研究旨在评估以椰壳纤维与聚胺酯树脂为黏结剂之聚结板之螺丝拔出行为.在实验设计的基础上，通过对影响面板/螺杆相互作用的主要参数的评估，对拉拔行为进行了分析，以了解和描述拉拔行为.采用Box-Behnken方法，采用二阶响应模型进行了最大拉拔强度的预测，并进行了较好的逼近.该模型给出了控制面板/螺钉相互作用的主要参数的最佳组合，即：螺钉公称直径、导孔直径和螺钉穿透深度.后者对撤退力量的贡献最大.

KEYWORDS:

• Screw withdrawal
• coir fibers
• agglomerated panels
• design of experiment
• response surface method
• Box–Behnken design

关键词:

• 拔出螺钉
• 椰壳纤维
• 凝聚板
• 实验设计
• 响应面法
• Box-Behnken设计

Disclosure Statement

The authors declare that there is no conflict of interest

Additional information

Funding

This work was supported by the National Council for Scientific and Technological Development (CNPq) [grant number 301299/2010-2].