Baffle Plate Relief Edge Design for Tank Container Stress Reduction
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Solution Overview
Problem
Baffle elements in transport containers experience high local stresses at the connection ends with the container wall, leading to potential damage due to pressure and surge loads, especially when the free edges are stiff compared to the membrane-like container wall.
Innovation Solution
A baffle element with a connection end featuring a relief edge that smoothly transitions from the container wall to the free edge, forming a rib section, which reduces stress concentrations by distributing loads along the rib's flexible-elastic course and relocating peak stresses to a less critical area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the free edges of the baffle element are made stiff to reinforce the connection, then the structural strength is improved, but high local stresses occur at the connection ends causing potential damage to the container wall
Solution Approach 1:
The relief edge is designed with a smooth curved profile that transitions from the stiff free edge to the connection area, creating a flexible stress distribution path. This curved geometry allows the structure to deform elastically under load, distributing stresses along the relief edge rather than concentrating them at sharp corners or abrupt transitions.
Solution Approach 2:
The relief edge incorporates a curved geometric profile that replaces sharp corners and abrupt transitions with smooth radii. This curvature distributes the stress flow more evenly across the connection area, preventing stress concentration at the interface between the stiff free edge and the container wall connection.
2Reliability
If the baffle element covers at least 70% of the container cross section to meet transport regulations, then the surge reduction effectiveness is improved, but the complexity of the baffle element structure increases
Solution Approach 1:
The baffle element is divided into distinct functional zones: the free edge for surge interaction, the relief edge for stress management, and the connection area for structural attachment. This segmentation allows each zone to be optimized independently - the free edge can be stiff for surge reduction while the relief edge provides smooth stress transitions, simplifying the overall design process.
Solution Approach 2:
Different parts of the baffle element have different structural properties tailored to their specific functions. The free edge is made stiff to effectively interact with surging liquid, while the relief edge has a smooth curved geometry for stress distribution, and the connection area is designed for optimal attachment to the container wall. This localized optimization achieves regulatory requirements without unnecessary overall 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 significantly minimizes local stresses at the connection ends, reducing the risk of damage and leakage, while enhancing the fatigue strength and load capacity of both the baffle element and the container wall.
Implementation Method 1
the relief edge has a first section (15) which runs along the first connection area (11) and forms a rib section (16) with it, a second section (18) which connects the first section (15) to a free edge (7) of the baffle element (3), and the relief edge (14) runs smoothly between the first connection area (11) and the free edge (7)
Data Source
Figure 1~2
Figure 3~4B
Figure 5~6B
AI summary
The invention relates to a baffle plate element (3) with a connection end (10) which has a first connection region (11) for connecting to a container wall (6) and a discharge edge (14) that connects an end of a free baffle plate edge (7) to the first connection region (11). The discharge edge (14) has a first portion (15), which runs along the first connection region (11) and together with said region forms a rib portion (16), and a second portion (18), which connects the first portion (15) to a free edge (7) of the baffle plate element (3), and the discharge edge (14) runs smoothly between the connection region (11) and the free edge (7). The invention further relates to a transport container arrangement, in particular a tank container, comprising such a baffle plate element.