Mortar Shell Tail Unit Material Design
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Solution Overview
Problem
Mortar grenade tail unit wings are prone to tearing during handling due to inelastic materials, posing a risk of injury and affecting projectile trajectory, as they are not designed to absorb impact and fall loads effectively.
Innovation Solution
The tail unit is constructed in two parts with varying strength properties, using high-strength, low-elasticity materials for the tail unit and elastically deformable materials for the wing tail unit, connected via a sealed fine thread, allowing for load compensation and easy recognition of deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inelastic material is used for the tail unit wings, then the material has high tensile strength, but the wings are prone to tearing during handling due to impact and fall loads
Solution Approach 1:
The patent changes the material parameters of the tail unit wings from inelastic to elastic material. This parameter change allows the wings to deform elastically under impact and fall loads during handling, absorbing the energy without tearing, while maintaining sufficient tensile strength for launch loads.
Solution Approach 2:
The patent applies different material properties to different parts of the tail unit. The tail unit shaft retains inelastic material with high tensile strength for withstanding launch loads, while the tail unit wings are made of elastic material to absorb impact loads during handling. This local differentiation of material quality resolves the contradiction between tensile strength and impact resistance.
2Reliability
If elastic material is used for the tail unit wings, then the wings can absorb impact loads, but the material has lower tensile strength
Solution Approach 1:
The patent applies different material properties to different parts of the tail unit. The tail unit shaft retains inelastic material with high tensile strength for withstanding launch loads, while the tail unit wings are made of elastic material to absorb impact loads during handling. This local differentiation of material quality resolves the contradiction between tensile strength and impact resistance.
3Device complexity
If aluminum alloy is used for both tail unit and wing tail unit, then the structure has uniform properties, but deformations after improper handling are not easily recognizable
Solution Approach 1:
The patent creates a visible contrast by using materials with different deformation characteristics in different parts of the tail unit. When the elastic wing tail unit deforms under improper handling, the deformation is visually distinguishable from the rigid tail unit shaft, making damage detection easier without increasing overall structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances resistance to launch loads while increasing elasticity to absorb impact loads, preventing wing tearing and cracking, ensuring safer handling and stable projectile trajectories.
Implementation Method 1
the material of the wing tail unit should be elastically or plastically deformable in order to absorb the fall and impact loads occurring during handling before the mortar shell is fired
Implementation Method 2
Because of the explosive reaction of the propellant charge and the subsequent strong acceleration, high tensile forces usually act on the tailstock
Data Source
AI summary
The invention relates to a mortar shell (1) having a projectile body, a fin structure (2) which is connected to the projectile body, and a wing fin (3) which is attached to the rear of the fin structure (2). In order to ensure that the mortar shell (1) securely absorbs both the loads which act on it during firing and also the impact stresses which occur in the event of improper handling of the mortar shell (1), without causing deformation in the region of the fin structure (2) or cracks to form in the region of the wing fin (3), the invention proposes using a material for the fin structure (2) of the mortar shell (1) which has a high tensile strength but is only slightly elastically or plastically deformable. In contrast, an elastically or plastically deformable material is used for the wing fin (3), it being possible for the tensile strength of said material to be lower than the tensile strength of the material of the fin structure (2).