Strength analysis of a cutting kinked curve plate with clamped free edges of a chisel type deep tiller

Abstract

Currently existing chisel type deep tillers have a number of disadvantages. The authors propose a research of the strength of a deformer system element of an experimental chisel type deep tiller in the form of kinked plates with clamped-free edges. The present paper analyses the possibility of lengthening of the horizontal elements of the deep tiller shank deformer system without loss of their strength and significant change in their thickness. A mathematical model of a thin elastic homogeneous isotropic plate with clamped-free edges was used. A modified model of the kinked plate is proposed, which has not been investigated earlier. The presented problem is solved numerically. Calculation is performed in the first approximation for the stress-strain state of two isotropic fixed kinked plates with clamped medial edges, symmetrically fixed on a vertical shank, set obliquely to the vertical axis, having equal stiffness and constant cross-section along the entire length (volume objective). It is found that the reduction of the actual plate thickness by more than 1/3 of the design thickness is the most dangerous case. This result leads to failure of a separate fragment of the kinked plate. The proposed thickness of 2 mm does not immediately result in failure of a separate fragment of the part. The plate of the investigated form, made of C255 grade steel, will not provide sufficient strength of the part and its fixing on the deep tiller’s shank. The paper proves the possibility of using kinked plates of the given shape having a variable thickness profile.