final ppt for viva 9.7.12 sathya
TRANSCRIPT
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.