Mechanical Thermal Loading Analysis Device for Structural Components
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Solution Overview
Problem
Current methods for predicting combined mechanical and thermal loading in aerospace design, such as linear elastic Finite Element Analysis, often generate overly conservative results due to neglecting plastic deformation and joint compliance, leading to excessive material usage and weight penalties.
Innovation Solution
A device and method involving a three-member system with dissimilar materials, where the second member is fastened between the first and third members, allowing for controlled mechanical and thermal loading to measure failure loads and apply corrections for more accurate analysis, emulating real-world structures and reducing thermal load considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If linear elastic FEA is used for analysis, then computational resources and time are reduced, but failure load predictions become overly conservative
Solution Approach 1:
The patent changes the fundamental parameters of the analysis model by transitioning from linear elastic assumptions to elastic-plastic analysis, incorporating temperature-dependent material properties, and accounting for geometric nonlinearity. This allows the model to capture real structural behavior more accurately while maintaining computational efficiency through reduced-order modeling approaches.
Solution Approach 2:
The patent employs composite material models that combine elastic and plastic constitutive relationships, integrate temperature-dependent material properties, and account for anisotropic behavior. This composite approach allows simultaneous capture of mechanical and thermal effects without requiring fully complex multi-physics simulations.
2Device complexity
If plastic deformation and joint compliance are neglected, then analysis complexity is reduced, but thermal-expansion-induced stresses are overestimated
Solution Approach 1:
The patent introduces dynamic material behavior through elastic-plastic constitutive models that evolve with loading history, and incorporates thermal creep effects that develop over time. This dynamic approach allows the structure to adapt to thermal stresses through plastic deformation and creep, reducing peak stress predictions while maintaining model accuracy.
Solution Approach 2:
The patent changes the material model parameters from fixed elastic properties to temperature-dependent elastic-plastic properties, including yield strength, hardening modulus, and creep coefficients. This allows the material to exhibit different stiffness and strength characteristics under thermal loading compared to simple elastic models.
3Adaptability or versatility
If dissimilar materials with different coefficients of thermal expansion are joined, then structural versatility is improved, but thermally induced stresses increase
Solution Approach 1:
The patent employs composite material models that simultaneously account for dissimilar material properties, including different coefficients of thermal expansion, elastic moduli, and yield strengths. The elastic-plastic constitutive models capture the complex interaction between materials with mismatched thermal expansion characteristics, allowing accurate prediction of thermally induced stresses and potential failure.
Solution Approach 2:
The patent applies local quality analysis by examining the specific material interface between dissimilar components, accounting for localized stress concentration effects, and considering the specific combination of material properties at each joint location. This localized approach allows tailored analysis of thermally induced stresses at critical interfaces.
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 approach provides more accurate failure load predictions, reducing material requirements and avoiding weight penalties by accounting for plastic deformation and joint compliance, thus improving design efficiency and structural integrity.
Implementation Method 1
The device can be configured to mechanically load the first, second, and third members by applying equal and opposite force to protruding ends of the first, second, and third members
Implementation Method 2
the materials, which would expand and/or contract different amounts in the unrestrained state, are constrained to deflect the same amount by the presence of the joint
Data Source
AI summary
A device for analysis of mechanical and thermal loading of structures can include: a first member comprising first material; a second member comprising second material; and a third member comprising the first material. The second member can be fastened at least partially between the first and third members. The device can be configured to mechanically load the first, second, and third members by applying equal and opposite force to protruding ends of the first, second, and third members. A device for analysis of mechanical and thermal loading of structures can include: a first member comprising first material; and a second member comprising second material. The first member can be fastened at least partially between portions of the second member. The device can be configured to mechanically load the first and second members by applying equal and opposite force to protruding ends of the first and second members.