Crash Worthiness

A SEMINAR A SEMINAR

ONON

CRASHWORTHINESSCRASHWORTHINESS

byby

SANTHOSH.NSANTHOSH.N

WHAT DO YOU MEAN BY CRASHWORTHINESS

• Ability of vehicle to prevent injuries to the occupants in the event of collision

• Deals with primarily with second collision.

• Cause of the accident is considered irrevalent in crashworthiness cases.

IMPORTANT FACTORS IN IMPORTANT FACTORS IN CONSIDERATION FOR DETERMINING CONSIDERATION FOR DETERMINING

CRASHWORTHINESSCRASHWORTHINESS

Could the vehicle occupants have Could the vehicle occupants have fared betterfared better

Could some feature that was Could some feature that was lacking in the vehicle have reduced lacking in the vehicle have reduced the occupant injuriesthe occupant injuries

Crashworthiness not same as vehicle safety

• Vehicle safety is determined by both crashworthiness and accident avoidance features such as anti-lock brakes and wider tires.

• Crashworthiness features include as discussed before.

Concerns in crashworthinessConcerns in crashworthiness

Basically, crashworthiness is Basically, crashworthiness is concerned with whether the concerned with whether the manufacture designed the vehicle manufacture designed the vehicle and its components so that it is safe and its components so that it is safe for any reasonably foreseeable usefor any reasonably foreseeable use

Manufacturing error Manufacturing error Design error Design error Failure to warnFailure to warn

Second collision

• The second collision is a collision following the impact of the vehicle and occupant contacting the vehicle the vehicle structure or being ejected from the vehicle.

• Restraint system of the occupant within the vehicle prevents the second collision.

Features that contribute to a vehicle crashworthiness include

• Seat belts

• Air bags:

• Functional door latches:

• Side impact zone• Front and rear crumple zone

TOYOTA

volvo G-40

• Sturdy seat backs

• Safe fuel system

Purpose of vehicle Purpose of vehicle restraintsrestraints

A vehicle restraint system is generally A vehicle restraint system is generally compromised of the lap belt, shoulder belt, compromised of the lap belt, shoulder belt, inertia reel mechanism, seat seat back and belt inertia reel mechanism, seat seat back and belt and seat attachments to the structure of the and seat attachments to the structure of the vehicle.vehicle.

It is associated with devices to cushion the It is associated with devices to cushion the blow or absorb energy from the second impact. blow or absorb energy from the second impact.

Padded dashboard or an energy absorbing Padded dashboard or an energy absorbing mechanism at the bottom of the seat to lesssen mechanism at the bottom of the seat to lesssen

Vertical loading on the occupant.Vertical loading on the occupant.

INEVITABLE SITUATIONINEVITABLE SITUATION

Principles of automotive safety Principles of automotive safety designdesign

Roof structure designRoof structure design

Door latch designDoor latch design

Automotive window designAutomotive window design

Interior designInterior design

Seat designSeat design

Side impact designSide impact design

The physics behind The physics behind crashworthinesscrashworthiness

• Kinematics: Analysis of motionKinematics: Analysis of motionVelocityVelocityAccelerationAcceleration

• Newton’s laws of motionNewton’s laws of motion

• Dynamics: Analysis of forces & their Dynamics: Analysis of forces & their effects.effects.

OTHER FACTORS:HUMAN OTHER FACTORS:HUMAN FACTORSFACTORS

Psychotropic agents (drugs)Psychotropic agents (drugs) Driver performanceDriver performance Reaction timesReaction times Driving conditionsDriving conditions Driving terrainDriving terrain Knowledge of the conditions and Knowledge of the conditions and

terrainterrain Performance of the vehiclePerformance of the vehicle Rules of the landRules of the land

RESEARCH PROGRAMSRESEARCH PROGRAMS

ULSAB-AVC (ultra light steel auto body) ULSAB-AVC (ultra light steel auto body) (advanced vehicle concepts)(advanced vehicle concepts)

Is the most recent addition to the global steel Is the most recent addition to the global steel industry’s series of initiatives offering steel industry’s series of initiatives offering steel solutions to the challenges facing automakers solutions to the challenges facing automakers around the world to increase the fuel efficiency around the world to increase the fuel efficiency of automobiles, while improving safety and of automobiles, while improving safety and performance and maintaining affordability. performance and maintaining affordability.

CONCLUSIONCONCLUSION

Research efforts as the (ULSAB) project Research efforts as the (ULSAB) project exemplify the attempt to optimize the use exemplify the attempt to optimize the use of steel in automobile design. Also of of steel in automobile design. Also of importance are efforts to develop new importance are efforts to develop new high-strength steels as replacements for high-strength steels as replacements for carbon steels.carbon steels.

Use of Hydro formed componentsUse of Hydro formed components

CASE STUDY

March 13 2002

Toyota recalled 273,743 runner SUV's because of handling problem that makes the vehicle hard to control if it is overloaded and the driver makes a hard turn.

September 19, 2002

Honda is recalling 5,57000 cars in Japan for defective audio equipment that can lead to fire and flawed engine oil seal that con cause leaks. The electronic part con heat up excessively and cause the speaker to catch fire.

THANK YOU THANK YOU

ONE AND ALLONE AND ALL