S.N.

Sathiya Narayana

Under the Guidence of

Mr.

Suresh KumarAssociate Professor

(Head of the Department Mech) Jayaram Engineering College , Trichy.

A parametric

study of hybrid joint by varying the three dimensional parameters of the joint will be carried out using FEA software

To

investigate the stress distribution of various configuration of single lap joint by experimental analysis .

Modeling

and analysis of 3-D models of

the Bonded, Riveted and Hybrid joints were carried out using ANSYS FEA software and also Tensile Strength of these

joints were carried outTesting Machine(UTM).

using Universal

HYBRID JOINT

BONDED JOINT

RIVETED JOINT

HYBRID JOINT

MODELLING & ANALYSIS

The various Joints were Prepared for analysis Such Joints are

Bonded JointRiveted Joint Without Adhesive Hybrid Joint

Bonded joints can be made by gluing together pre-cured laminates with the suitable adhesives or by forming joints during the manufacturing process, in which case the joint and the laminate are cured at the same time (co-cured). In general, there are numerous advantages of adhesive bonded joints over the traditional mechanical fastened joints These advantages include large bond area for load transfer, low stress concentration, smooth external surfaces at the joint, less sensitivity to cyclic loading, time and cost saving, high strength to weight ratio, electrical and thermal insulation, conductivity, corrosion and fatigue resistance, crack retardation, damping characteristic and so on.

Disassembly

is impossible without component damage. They can be severely weakened by environmental effects. They require surface preparation. Joint integrity is difficult to confirm by inspection. Thus ensuring a quality of bonding has been a challenging task.

The

behavior of riveted joints is also influenced by rivet parameters such as rivet size, clamping force, hole size and tolerance. Of these parameters, the clamping force, that is, the force exerted in the through thickness direction by the closing of the fastener, is of critical importance Advantages of riveted joints are thatNo surface preparation of composite is required. There are no abnormal inspection problems.

Hybrid

joints have a combination of adhesive bonding and mechanical fasteners The advantages of using a combined bonded-riveted design apply mainly in a repair situation. It is generally accepted that a bonded joint is stronger than a mechanically fastened joint and a welldesigned bonded joint is stronger than a hybrid joint.

Design and Analysis - ProcedurePROCEDURE

MODELING (CATIA)

ANALYZING (ANSYS)

CREATING PARTS

MAKING ASSEMBLY

APPLYING ELEMENT VALUES

SOLVER

POSTPROCESSOR

APPLYING BOUNDERY CONDITIONS

SOLVING THE MODEL

RESULTS

APPLYING LOADS

Joints in CATIA Models

Meshed Model Bonded Joint

Result Von Misses Stress Bonded Joint

Meshed Model Rivited Joint

Result Von Misses Stress Riveted Joint

Meshed Model Hybrid Joint

Result Von Misses Stress Hybrid Joint

Graph

Manual method is adopted. Billet size 300 mm x 300 mm Thickness of 3.5 mm. (3 layers) Epoxy hardener ratio -> 10:1 Curing time-12 Hrs at Room temperature. Load applied-10 kg.

Material Identification Adhesive Selection

ManufacturingLaminate Cutting Test Sample Preperation Testing Results & Discussion

Resin is to transfer stress between the reinforcement

fibers, act as a glue to hold the fiber together.Epoxy LY556 is selected.

Hardner HY951 at room temperature.

The mould should be well cleaned and dry. Release agent is applied. The epoxy mixture is uniformly applied.

First woven mat is laid into the moulded.Apply the resin on mat by brush.

Second mat is laid to first matRepeated the process up to 3 layers Mould is closed.

SAMPLE ID

DISPLACEMENT (mm)

BREAKING LOAD (MPa)

BONDED JOINT RIVETED

2.54

22.56

2.32

46.40

JOINTHYBRID 3.12 56.96

In the proposed work, FEA for the prediction of stress distribution in bonded, riveted and hybrid joints has been carried out. 3-D models were

created and analyzed using ANSYS FEAsoftware and also Tensile Strength of these

joints were carried out using Universal TestingMachine (UTM).

Thus from the present study, it was found that a

well-designed hybrid joint is very efficient whencompared to bonded or riveted joints in the case of

repair situation in aircraft structures.

Through the experimental work the found that, the tensile specimens were prepared with all above discussed joints and their test were carried out by Universal Testing Machine with Data Acquisition System.

The results says that, the hybrid joint strengthening is more

than the other two joints. Also through the hybrid joints theapplication of the Aircraft and Automobile Structure is mostly achieved tough the strengthen provided by the hybrid joints.