Stress Analysis of Prithvi Missil Wing Subjected to Aerodynamic Forces

The stress problem of Prithvi missile wing is investigated . The analysis is carried out by the finite element method by using the ASKA software package. Finite element analysis is carried out for pressure loading, and thermal loading arising from aerodynamic heating . The,analysis for pressure loading indicates that there is stress concentration at the wing root region results obtained for various cases of this loading are presented and discussed. The distortion of the wing produced by aerodynamic heating has also been displayed

A Report on the Preliminary design of Composite Cocured LCA Fin

A report on the preliminary design of composite cocured LCA fin is presented. A six spar structural configuration involving laminated carbon composite construction is employed in the design of torsion box. The design studies are carried out using a strength of materials based analysis. Three critical loading cases have been considered in the investigation. Results for various cases studied are presented and discussed

Stress Analysis of a Missile wing subjected to Aerodynamic forces and heating

This is the Project proposal for the theoretical analysis of Prithvi wing subjected to pressure and thermal load

Three-dimensional stress problem of a finite thick plate with a through crack under tension

The three dimensional state of stress in a finite thick rectangular plate with a through-crack under tension is investigated. It is found that the in-plane stresses and the transverse normal stress are singular while the transverse shear stresses are of the order of unity. The only type of singularity encountered is that of inverse square root all through the plate thickness including the corner points at the plate faces. The stress intensity factor which is found to vary with Z and the thickness ratio h/a drops rapidly in a thin boundary layer near the plate faces, but without actually vanishing there. The stress intensity factor reduces exactly to that for the plane strain case when h/a +a . All the three components of the displacement field are finite at the crack front

Fatigue Analysis of an Aircraft Fin Lug

A study on the cumulative fatigue damage in crack initiation and growth is carried out for the metallic fin root fitting lug of an aircraft under spectrum loading. The analysis involves determination of life to crack initiation and crack propagation life. The influence of crack closure on the fatigue crack growth has also been taken into account in the analysis. Results obtained for a lug of Al-Cu alloy under the given spectrum loading are presented and discussed

On the stresses in the vicinity of an elliptic hole in a cylindrical shell under torsional loading

A perturbation solution is presented for the stresses around a small elliptic hole in an infinitely long circular cylindrical shell subjected to torsion. The major axis of the whole is taken to be parallel to the shell axis. For the limiting case of a crack, the general solutions in elliptic coordinates are expanded at the crack tip in polar coordinates to obtain stresses in the form usual to solutions for crack problems

On the stress problem of the pebble bed heat exchanger in a hypersonic wind tunnel

The stress prob1ens of pebble bed heat exchanger in the13; hypersonic wind tunnel at IISc, Bangalore, is investigated. The investigation is carried out in two stages: the first stage deals with the problem encountered during the preheating of pebble bed,13; while in the second stage pressure loading arising from tunnel blowdowns is considered. The heat transfer and the associated thermal stress problems of stage one as also the problem of pressure loading in th e presence of temperature occuring in stage two are analyzed using the finite element method with the aid of NASTRAN and ASKA software packages. The results obtained indicate the presence of stress concentration in the disc-flange13; region at the entry section and in the ellipsoidal capnear the exit section of pebble bed heat exchanger. The significance of finite element results presented with the aid of FEMVIEW interactive graphic processor is discussed in detail

Three-Dimensional stress problem of a finite thick plate with a through crack under tension.13;

The three dimensional state of stress in a finite thick rectangular plate with a through-crack under tension is investigated. It is found that the in-plane stresses and the transverse normal stress are singular while the transverse shear stresses are of the order of unity. The only type of singularity encountered is that of inverse square root all through the plate thickness including the corner points at the plate faces. The stress intensity factor which is found to vary with Z and the thickness ratio h/ alpha drops rapidly in a thin boundary layer near the plate faces, but without actually vanishing there

Improved procedure for the determination of apparent strain

An improved procedure for theoretically determining the apparent strain is proposed. Based on the results of an experimental study into the behaviour of high temperature strain gages in a varying thermal environment a theoretical formula is developed. One of the significant features of the proposed formula lies in its ability to predict the apparent strain without actually carrying out the experiment, provided the relevant strain gage material parameters as also the coefficient of thermal expansion of the specimen material are known. A comparison study of the results obtained by using the proposed formula with the experimentally determined results shows excellent agreement. Its application to the development of improved temperature compensated gages is also indicated

A report on the analysis of rear fitting assembly for LCA fin

Finite Element Analysis is carried out for the rear fitting assembly of the co-cured composite fin for LCA. The components of the assembly are the metal fitting and CFC root of the torsion box which are connected by bolted joints. The stress distribution around the bolt holes, which are of particular interest, are presented in detail and discussed