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NAME : Dr. Ahmad Mujahid Ahmad Zaidi MIET MIAENG

DESIGNATION : SENIOR LECTURER

E-MAIL : mujahid@uthm.edu.my

CONTACT NUMBER : +6-07-4537780 (Office)

RESEARCH INTEREST : Structural Mechanics, Impact and Explosion Engineering,Condition Monitoring.

RESEARCH GRANTS : FRGS/Industrial projects

RESEARCH TITLE 1 : Design and development of safety helmet for ballistic applicationusing Kevlar and natural fibres

Impact and blast phenomena can persuade significant dynamic loading which can be caused a

serious of brain injuries when the loading is directly applied to the head part of victim with

and without proper head protection. Therefore the investigation on head protection from

these phenomena is necessary to be conducted. In this study, the application of Kevlar and

bio-fibres material will be investigate based on their optimum combination to resist and

absorb impact and blast loading. Experimental and numerical investigation will be conducted

to studies the influence parameters in the safety helmet design. The safety helmet will be

fabricated based on the outcome finding.

MSc /PhD (research)

RESEARCH TITLE 2 : Investigation of missile trajectory in structural materials usingmesh-less approach

Great demand exist for more exists for more efficient design to protect personals and critical

components against impact by kinetic missiles, generated both accidentally and deliberately,

in various impact and blast scenarios in both civilian and military activities. In many cases,

projectiles can be treated as rigid bodies when their damage and erosion are not severe.

Therefore, the penetration resistance controls the motion of the projectile. Due to the

intricacy of the penetration mechanics, investigations are generally based on experimental

data. Conclusions of the experimental observations are then used to guide engineeringmodels. Penetration studies normally fall into three categories, i.e. empirical formulae based

on data fitting, idealised analytical models based on physic laws and numerical simulations

based on computational mechanics and material models. In this project a general framework

of the penetration mechanics for the rigid projectile will be developed. The framework will

be applied in numerical simulation using mesh-less method for predict the penetration

process. The target structures will be modeled in a mesh-less way by finite layers of the

target materials, which impose penetration resistance(using massage passing interface-MPI)

on the projectile through resistance function based on dynamic cavity expansion theory. The

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penetration resistance on the surface of the rigid projectile is a function of the instantaneous

velocity of that surface, which can be determined by the rigid body motion of the projectile.

Standard finite element method will be introduced to model the rigid body motion of the

projectile and is coupled with the mesh-less target by exchanging the velocities and stresses

through user-interfaces. Predictions of the final penetration depth will be compared with

corresponding existing experimental data.

MSc /PhD (research)

RESEARCH TITLE 3 : Development of fibre-reinforced foam concrete as a high-performance protective structure subjected to ballistic loading

Concrete is a common material for protective structures to resist impact and explosive loads.

In addition to nuclear industry requirements, the design of the containment buildings andinternal concrete barrier walls of nuclear facilities need to be considered to produce more

efficient protection against impact by kinetic projectile, generated both accidentally or

deliberately, in various impact and blast scenarios (e.g. failure of a pressurized vessel, failure

of a turbine blade or other high speed rotating machines, aircraft crashes, fragments

generated by accidental explosions, etc.). Recently, the demands on producing the lighter

concrete material have become interest in concrete research. Foamed concrete with fibre

reinforced is a possible alternative of lightweight concrete for producing intermediate

strength capabilities with excellent thermal insulation, freeze-thaw resistance, high-impact

resistance and good shock absorption. In this study, the penetration resistance and explosion

absroption of foamed concrete with fibre reinforced subjected to ballistic tests will be

investigated. Experimental investigations will be performed to tests material properties,

penetration depth and explosion absoption. Those tests will be further studies in numerically

and analytically based on physical laws to provide better knowledge on its(foamed concrete)

behaviours. It is expected that the uses of bio-fibred reinforcement in foam concrete will

improve its strength properties and ballistic resistances.

MSc /PhD (research)

RESEARCH TITLE 4 : Application of bio-fibers reinforced as an alternative structure forhigh performance composite material

Nature continues to provide mankind generously with all kinds of rich resources in plentiful

abundance, such as natural fibres from a vast number of plants. However, since the last

decade, a great deal of emphasis has been focused on the development and application of

natural fibre reinforced composite materials in many industries. This is due to the natural

fibre composites are undergoing a high tech revolution and are replacing conventional

composites in high performance applications due to their advantages over conventional

reinforcements. For this reason natural fibre reinforced composite are applicable and need

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broader research programmes. Moreover, due to the relatively high cost of synthetic fibres

such as glass, plastic, carbon and Kevlar used in fibre reinforced composites and the health

hazards of asbestos fibres, it becomes necessary to explore natural fibres, e.g. cotton, sisal,

jute, palm oil, paddy, ijok, etc.

Despite the fact that natural fibres generally have poor mechanical properties and limitation

of applications compared with synthetic fibres, their use as reinforcement material has been

adopted since the beginning of mankind to make straw reinforced huts, etc. However, the

main advantages of these fibres are their availability in large quantities in many countries,

good thermal and acoustic insulating properties, better electrical resistance, higher

resistance to fracture and impact absorption, low density, low cost and ease to manufacture.

In this research, the influence of bio-fibres as reinforced composite will be investigate based

on its impact resistance and explosion absorption performances. Properties tests will be

conducted to obtained details of mechanical properties, which are based on the percentage

fibre composition with epoxy and polyester resins. The high speed penetration test will be

conducted to investigate the impact resistance of the test sample and further provide the

impact resistance guide line (based on velocity and penetration depth). Explosion test will beconducted to investigate the Blast Resistance Pressure Material (BRPM) and explosion

absorption. Further numerical simulation will be conducted to investigate the parametric

analysis on both impact resistance and explosion absorption performances and provide further

verification of experimental results. It is expected that the uses of bio-fibres as composite

reinforcement will provides excellent in strength properties and ballistic resistances.

MSc /PhD (research)

RESEARCH TITLE 5 : Application of Active Noise Control for Acoustic Cleaning Systems

Acoustic cleaners are air operated devices that radiate low frequency high energy sound

wave. The sound waves create vibrations that break apart and dislodge material deposits

from surfaces. The vibrations are powerful enough to break apart heavy concentrations of

particle but gentle enough to not harm the surfaces. Once the material has been dislodged,

gravity and/or gas flow will remove it. This project will be focus on application of Active

Noise Control (ANC) as an acoustic cleaner in a specific system. The project will be involvewith development a test rig which ANC can be implement as an acoustic cleaners. Simple

wave form will be generated in testing rig in order to produce high energy of vibration(to

dislodge material deposits) and the noise pollution will be cancel by the other source of

generated wave form.

MSc (research)