( A. D. Patel Institute of technology)

Prepared by:

Yash A. Lad khambhayta Mayur

(130010119047) (130010119042)

Analysis and selection of body member

sections, Body subframe and underfloor

structure

Content

Introduction

Selection of body member section, body subframe

and underfloor structure.

Analysis of body member section, body subframe

and underfloor structure by using SSS (simple

structural surfaces)method.

Simple van structure analysis by SSS method

Literature review

References

Selection of body member section

There are a number of cross-sections are available to be

used for the beam elements of the vehicle structure.

The cross-section may be solid or hollow as well as open

and closed.

The sections used for the long side and cross members

are channel section, box section, I-section, hat section,

and tubular section.

The selection of best section is critical since it depends on

loading condition.

Section is selected such that the deflection of the beam for

a given section area should be minimum.

Subframe There are generally three basic forms of the subframe.

1) A simple "axle" type which usually carries the lower control arms and steering rack.

2) A perimeter frame which carries the above components but in addition supports the

engine.

3) A perimeter frame which carries the above components but in addition supports the

engine, transmission and possibly full suspension. (As used on front wheel drive cars)

A subframe is usually made of pressed steel panels that are much thicker than

bodyshell panels, which are welded or spot welded together. The use

of hydroformed tubes may also be used.

The revolutionary monocoque transverse engined front wheel drive 1959 Austin Mini,

that set the template for modern front wheel drive cars, used front and rear subframes

to provide accurate road wheel control while using a stiff lightweight body. The

1961 Jaguar E-type or XKE used a tubular spaceframe type front subframe to mount

the engine gearbox and long bonnet / hood, to a monocoque 'tub' passenger

compartment. The subframe saw regular production in the 1960s and 1970s General

Motors X platform and F platform bodies and the 1985-05 M platform vans (Astro,

Safari).

Lamborghini_Aventador_LP_700-4_subframe

Underfloor structure Platform sharing is a product development method where different products and

the brand attached share the same components. The purpose with platformsharing is to reduce the cost and have a more efficient product developmentprocess. The companies gain on reduced procurement cost by taking advantageof the commonality of the components. However, this also limits their ability todifferentiate the products and imposes a risk of losing the tangible uniqueness ofthe product. The companies have to make a trade-off between reducing theirdevelopment costs and the degree of differentiation of the products.

A basic definition of a platform in cars, from a technical point of view, includes:underbody and suspensions (with axles) — where the underbody is made offront floor, underfloor, engine compartment and frame (reinforcement ofunderbody).Key mechanical components that define an automobile platforminclude:

1) The floorpan, which serves as a foundation for the chassis and other structuraland mechanical components

2) Front and rear axles and the distance between them - wheelbase

3) Steering mechanism and type of power steering

4) Type of front and rear suspensions

Underfloor Structure

Analysis

The analysis of body member sections, body subframe

and underfloor structure has been done by SSS method.

SSS means Simple Structural Surfaces.

Definition of SSS:

A plane structural element

(or subassembly) that can be considered as rigid only in

its own plane(i.e. flexible to out-of-plane load).

Sr.

No.

Title Publisher Conclusion Outcome

1 Computational

Analysis of a Car

Chassis Frame

under a Frontal

Collision

Diogo

Montalvão and

Magnus

Moorea

A simulation of the frontal

collision of a car frame

using non-linear FEA has

been presented. Three

frontal crash situations

were evaluated

In this paper, the profile of

deformation in the simulations

run is comparable to the

deformation which is visible in

the videos of real tests, even if

important components, like the

engine, have not been

considered in the simulations.

2 DESIGN AND

ANALYSIS OF A

BUS BODY SIDE

FRAME

SREENATH S

and K

KAMALAKKA

NNAN

The light weight approach

for a bus body influences

the manufacturing cost,

vehicle handling and

stability as well as the

overall performance.

The two methods adopted for

the light weight design are by

reducing the number of frames

elements and supporting

frames elements and secondly

the topology (thickness, gauges

etc.) optimization.

3 Design

Modification of

Ladder Chassis

Frame

Mr.Birajdar M.

D. and Prof.

Mule J.Y.

The deflection values

calculated are within limit &

Reduction in height of span

EG is possible up to fourth

case

Comparison of results revel that

as area is decreasing the

generated stresses in side

member of ladder chassis are

increasing but it is within

allowable limit of stresses.

Literature Review

Sr.

No.

Title Publisher Conclusion Outcome

4 Modeling And

Analysis of An

Innova Car

Chassis Frame

by Varying

Cross Section

𝐍.𝐒𝐈𝐕𝐀 𝐍𝐀𝐆𝐀𝐑𝐀𝐉𝐔, 𝐌.𝐕.𝐇.𝐒𝐀𝐓𝐇𝐈𝐒𝐇 𝐊𝐔𝐌𝐀𝐑 and 𝐔.𝐊𝐎𝐓𝐄𝐒𝐖𝐀𝐑𝐀𝐎𝟑

To observe the all results and

to compare the rectangular

and c-type cross sectional

steel chassis frame from

ansys. The rectangular

section von mises stress was

68.838N/mm2 and C-section

von mises stress was

146.255N/mm2.

C-section stress is higher than

the rectangular section ,but it is

with in the ultimate strength, so

it is usable strength. So that the

C-type cross section will

reduces the weight ,area,

production time and as well as

manufacturing cost.

5 Modelling,

Analysis &

Optimization of

TATA 2518 TC

Truck Chassis

Frame using

CAE Tools

Akash Singh

Patel and Atul

Srivastava

The existing heavy vehicle

chassis of TATA 2518 TC is

taken for design and analysis

for different materials. After

analysis a comparison is

made between existing

structure steel chassis and

alloy steel materials in terms

of deformation and stresses,

to select the best one.

Different practices are available

for chassis modification. Here

suitable changes are made in

the design using two standard

methods(Boxing optimization

technique and Reinforcement

Optimization Technique)and the

analysis is done to observe the

reduction in the stress levels

6 Static Analysis

Of Chassis

Frame Of

Electric Tricycle

Amol Badgujar

and

P.A.Wankhade

The result of FE analysis is

7.81 % lesser than the result

of analytical calculation. The

difference is caused by

simplification of model and

uncertainties of numerical

calculation .Maximum

displacement occurred at

The location of maximum Von

Misses stress and maximum

shear stress are at bottom of

mounting bracket at front of

chassis.

Sr.

No.

Title Publisher Conclusion Outcome

7 Structural

Analysis of a

Heavy Vehicle

Chassis Made

of Different

Alloys by

Different Cross

Sections

Abhishek

,Mr.

Pramod,

Abdul and

Mohammad

Mamoon

Khan4

The results shows that for all

of the materials that have been

tested in this text, AISI 4130

steel alloy shows better

performance than all of the

other metal alloys.

The AISI 4130 alloy is lighter

than all of the alloys and on

the same side providing the

strength as well.

8 Development of

a Rapid Design

System for

Aerial Work

Truck Subframe

with UG

Secondary

Development

Framework

Liu Xinhua,

Li Qi, Liu

Youhui and

Yin Jilin

In order to realize the rapid

design of aerial work truck

subframe, this paper puts

forward the wizardbased

parametric modeling method

and develops the prototype

system based on UG

development platform and VC

6.0 compile environment.

The system can significantly

improve the design efficiency

of the subframe, shorten the

design cycle and provide 3D

model for the follow-up

simulation analysis.

9 An extruded and

welded

subframe for

sports cars

The general

motors

Plant personnel reported that

hydro’s subframe is easier to

install than the previous

stamped aluminium

component.

The sub-frame produces more

uniform structure and always

an asset in the assembly

process.

References[1] P. S .Madhu and T. R. Venugopal, “Static Analysis, Design Modification and Modal Analysis

of Structural Chassis Frame,” International Journal of Engineering Research and applications.

Vol.4, pp.06-10, Issue 5 (Version 3), May2014.

[2] H. Patel, K. C. Panchal and C. S. Jadhav, “Structural Analysis of Truck Chassis Frame and

Design Optimization for Weigh Reduction,” International Journal of Engineering Advanced

Technology (IJEAT), Volume-2, Issue -4, April-2013.

[3] K. I. Swami and Prof. S. B. Tuljapure, “Effect of Torque on Ladder Frame Chassis of Eicher

20.16,” Int. Journal of Engineering research and Applications, Volume 4, Issue 2(Version 1),

February 2014.

[4] J. S. Nagaraju, U. H. Babu, “Design and Structural Analysis of Heavy Vehicle Chassis

Frame Made of Composite Material by Varying Reinforcement Angles of layers,” International

journal of Advance Engineering research and studies, Vol.1, Issue 2, January-March, 2012.

[5] A. Singh, V. Soni, A, Singh, “Structural Analysis of Ladder Chassis for Higher Strength,”

International Journal of Emerging Technology and Advanced Engineering, Volume 4, Issue 2,

February 2014.

[6] Strength of Materials by S. Ramamrutham.