Estimation of withdrawal strength of different nail diameters in coconut (Cocos nucifera) lumber subjected to accelerated aging cycles using ultrasonic tests and multiple linear regression analysis

Key Points

• The withdrawal strength of nails in coconut lumber exhibits significant variation depending on diameter.
• Average withdrawal strength values ranged from 150 to 300 Newtons across tested nail sizes.
• Analysis employed ultrasonic tests and multiple linear regression to quantify strength variations.
• Findings highlight the importance of nail diameter and aging effects for construction applications.