Effect of grain angle on the strain distribution during orthogonal cutting of hinoki (Chamaecyparis obtusa) measured using a digital image correlation method

Abstract

Abstract The strain associated with orthogonal cutting with and against the grain of hinoki (Chamaecyparis obtusa) was measured. Digital image correlation method was used to measure strain distributed in the area within 0.5 mm of the cutting edge. The relationship between strain and the use of different grain angles (− 15° ≤ $$\varphi $$ φ ≤ + 15°) was investigated. The compressive strain parallel to the cutting direction was detected in the area above the path of the cutting edge regardless of $$\varphi $$ φ . The tensile strain normal to the cutting direction which generated cleavage ahead of the tool decreased with increasing $$\varphi $$ φ , when the cutting angle was 30°. While cutting with the grain, shear strain above the path of the cutting edge was positive when the cutting angle was 30°, although it changed to negative with larger cutting angles. The maximum principal strain given by a cutting angle of 50° was less affected by $$\varphi $$ φ than those given by the other cutting angles. The maximum principal strain ahead of the tool was minimized when the cutting angle was 50° and + 5° ≤ $$\varphi $$ φ ≤ + 10°.

Keywords

• Orthogonal cutting
• Digital image correlation
• Grain angle