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Analysis and selection of body member sections, Body subframe and underfloor structure
( A. D. Patel Institute of technology)
Yash A. Lad khambhayta Mayur
Analysis and selection of body member
sections, Body subframe and underfloor
Selection of body member section, body subframe
and underfloor structure.
Analysis of body member section, body subframe
and underfloor structure by using SSS (simple
Simple van structure analysis by SSS method
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
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
Section is selected such that the deflection of the beam for
a given section area should be minimum.
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
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,
Platform sharing is a product development method where different products and
the brand attached share the same components. The purpose with platform
sharing is to reduce the cost and have a more efficient product development
process. The companies gain on reduced procurement cost by taking advantage
of the commonality of the components. However, this also limits their ability to
differentiate the products and imposes a risk of losing the tangible uniqueness of
the product. The companies have to make a trade-off between reducing their
development 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 of
front floor, underfloor, engine compartment and frame (reinforcement of
underbody).Key mechanical components that define an automobile platform
1) The floorpan, which serves as a foundation for the chassis and other structural
and 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
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).
Title Publisher Conclusion Outcome
Analysis of a Car
under a Frontal
A simulation of the frontal
collision of a car frame
using non-linear FEA has
been presented. Three
frontal crash situations
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
The light weight approach
for a bus body influences
the manufacturing cost,
vehicle handling and
stability as well as the
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
D. and Prof.
The deflection values
calculated are within limit &
Reduction in height of span
EG is possible up to fourth
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.
Title Publisher Conclusion Outcome
4 Modeling And
Analysis of An
𝐀𝐑 and 𝐔.𝐊𝐎𝐓
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
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
TATA 2518 TC
Patel and Atul
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
technique and Reinforcement
Optimization Technique)and the
analysis is done to observe the
reduction in the stress levels
6 Static Analysis
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
The location of maximum Von
Misses stress and maximum
shear stress are at bottom of
mounting bracket at front of
Title Publisher Conclusion Outcome
Analysis of a
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
Li Qi, Liu
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
9 An extruded and
Plant personnel reported that
hydro’s subframe is easier to
install than the previous
The sub-frame produces more
uniform structure and always
an asset in the assembly
 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.
 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.
 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),
 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.
 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,
 Strength of Materials by S. Ramamrutham.