Airframe Stress Analysis and Sizing by Michael C. Niu

By Michael C. Niu

The motive of this booklet is to supply a primary knowing in skinny sheet development. The emphasis is on functional program with enter from either fabric power and hands-on adventure. a large amount of fabric at the sizing of metal airframe is gifted in tables, charts and/or curves which are according to previous adventure and/or try effects. step by step methods are integrated each time attainable and examples of numerical calculation are incorporated to explain both the tactic of sizing or using layout facts and layout curves to provide engineers a real-world feeling of ways to accomplish the best buildings. The cautious collection of structural configurations and fabrics that are mixed to supply an financial layout whereas additionally contemplating the consequences of static, fatigue, fail-safe necessities, harm tolerance and reparability also are vital matters during this booklet.

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Airframe Stress Analysis and Sizing

The purpose of this e-book is to supply a primary figuring out in skinny sheet development. The emphasis is on useful program with enter from either fabric energy and hands-on event. a large amount of fabric at the sizing of steel airframe is gifted in tables, charts and/or curves which are in line with earlier adventure and/or try effects.

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Y” I... MI” V.. “ 1 . - 1 . 1 I 1 I I I I 1 I I I I I I I I I I I I I ~ I ~~ E. 002 E (strain) Fig. ,,and n parameters (these values can be obtained from material data) in non-dimensional form: Eq. 1 ‘n’ values range between 8 and 35 and: Higher values are good for column strength and buckling Lower values are good in redundant structures which have better redistribution of loads 62 Material Properties (A) MODULUS Up to the elastic limit the slope of the f (stress) vs. E (strain) curve is constant and above the elastic limit E is replaced by E, (tangent modulus) which varies with stress level.

The “flat top” of the stress-strain curve indicates that for a large proportion of the total allowable strain, the corresponding stress is at, or very near, the allowable ultimate or “breaking” stress of the material. This means that any fiber of the material will support ultimate stress while undergoing considerable strain. It is this effect which permits other fibers, operating at lower stress engineer shall understand its characteristics. This is the first step prior to performing stress analysis or sizing work correctly.

The “flat top” of the stress-strain curve indicates that for a large proportion of the total allowable strain, the corresponding stress is at, or very near, the allowable ultimate or “breaking” stress of the material. This means that any fiber of the material will support ultimate stress while undergoing considerable strain. It is this effect which permits other fibers, operating at lower stress engineer shall understand its characteristics. This is the first step prior to performing stress analysis or sizing work correctly.

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