Multi-Part Marman Band Clamp Release With Retained Bolt Energy
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Solution Overview
Problem
Single-piece Marman clamps are difficult to manufacture and install due to high preload consumption, while two-piece clamps lack built-in spring force, leading to separation issues when activated.
Innovation Solution
A two-piece Marman clamp system with semicircular ring halves and a mechanical release mechanism using an explosive bolt to separate the ends, where the bolt's energy is retained to aid in efficient separation through a capture fastener, maintaining the connection and utilizing pressurized gases for reliable separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-piece Marman clamp is used, then the clamp has built-in spring force that easily spreads the clamp apart when activated, but the clamp is difficult to manufacture and install with high preload consumption
Solution Approach 1:
The clamp is divided into multiple segments (typically two semicircular halves) that are assembled together, eliminating the complexity of manufacturing a single-piece clamp with built-in spring force while maintaining the clamping function through the assembly of simpler components
2Ease of manufacture
If a two-piece Marman clamp is used, then the clamp is simpler to manufacture, but the clamp lacks built-in spring force causing separation problems when activated
Solution Approach 1:
The clamp halves are pre-assembled and pre-loaded onto the cylindrical interface before activation, establishing the clamping force in advance. The mechanical release system is pre-positioned to ensure reliable separation when activated, combining the manufacturing simplicity of two-piece design with the reliability of pre-established connections
3Ease of operation
If a mechanical release with explosive bolt is used, then the separation of clamp ends is achieved, but the separated portions of the mechanical release need to be captured to aid in separation
Solution Approach 1:
A retainer mechanism acts as an intermediary between the explosive bolt components and the clamp halves, capturing the separated portions of the mechanical release (nut and bolt shaft) and using them as mediators to aid in the separation process by maintaining connection to the clamp ends while the explosive force acts
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
The solution enhances the manufacturing ease and reliability of the Marman clamp system by effectively utilizing the energy from the explosive bolt for consistent and reliable separation of the clamp ends, reducing the need for additional separation force and improving performance.
Implementation Method 1
The mechanical release may include an explosive bolt that is used to release the ends of the halves
Implementation Method 2
detonating an explosive bolt of a mechanical release that couples together ends of clamp parts of the Marman clamp
Data Source
AI summary
A Marman band clamp has multiple parts, such as two halves, that together make up a ring. The halves are joined by diametrically opposed mechanical connections, one of which is a mechanical release separably mechanically coupled ends of the parts (halves). The mechanical release may include an explosive bolt that is used to release the ends of the halves. The mechanical release may capture portions of the release at the ends of the ring halves after severing of the explosive bolt. A nut may be retained by an end of one of the halves by use of a retainer fastener, such as a pin, to prevent the nut from separating from the ring half end when the bolt is severed. This helps retain the pressurized gases between the severed part of the bolt longer, better using the energy from the pressurized gases to reliably separate the ends of the halves.