En
  • دکتری (1392)

    مهندسی مکانیک

    تربیت مدرس، تهران، ایران

  • کارشناسی‌ارشد (1388)

    مهندسی مکانیک

    تربیت مدرس، تهران، ایران

  • کارشناسی (1386)

    مهندسی مکانیک

    صنعتی شریف، تهران، ایران

  • ضربه در سازه های کامپوزیتی
  • ضربه در سازه و بدنه خودرو
  • مواد و ساختارهای نوین جاذب انرژی
  • رفتار مکانیکی مواد در نرخ کرنش بالا

    دکتر حامد احمدی متولد اردیبهشت 1364 در مشهد، دیپلم ریاضی - فیزیک را در سال 1381 و دوره پیش دانشگاهی را در سال ‏‏1382 در دبیرستان شهید هاشمی نژاد مشهد (تیزهوشان) گذرانده است. ایشان مدرک کارشناسی مهندسی مکانیک را در سال ‏‏1386 از دانشگاه صنعتی شریف، کارشناسی ارشد طراحی کاربردی را در سال 1388 و مدرک دکتری طراحی کاربردی (تخصص ‏مهندسی ضربه) را در سال 1392 هر دو از دانشگاه تربیت مدرس اخذ نموده است. ایشان از سال 1395 به عضویت هیئت علمی ‏دانشگاه تربیت مدرس و گروه طراحی کاربردی دانشکده مهندسی مکانیک در آمده اند و هم اکنون به عنوان مدیر گروه فعالیت ‏مینمایند. زمینه های تحقیقاتی مورد علاقه ایشان مکانیک ضربه در مواد مرکب، جاذب انرژی ضربه، طراحی و تحلیل سازه و بدنه ‏خودرو در تصادفات، تعیین رفتار مکانیکی مواد در نرخ کرنش بالا و مکانیک ضربه در بیومواد میباشد. ‏

    ارتباط

    رزومه

    Experimental investigation on energy absorption of auxetic structures

    M Najafi, H Ahmadi, G Liaghat
    Journal Papers , , {Pages }

    Abstract

    Experimental and Numerical Investigation on the Flexural Behavior of Composite-Reinforced Top-Hat Shape Beam

    Hamed Ahmadi, Gholam Hossein Liaghat
    Journal PapersMechanics of Advanced Composite Structures , 2020 June 19, {Pages }

    Abstract

    Top-hat hollow-section beams are widely used in passenger vehicle’s body-in-white structure because of their proper shape for the montage process and also crashworthiness advantages. Hollow section beams with top-hat cross-section are mostly employed in structures like B-pillar, rocker sill, and roof rail which are engaged in side impact collisions. In the present investigation, simplified top-hat beams are developed based on a conventional B-pillar with the aim of improving energy absorption characteristics. Reinforcements are conducted by employing fiber glass-epoxy composite material. Three types of reinforced beams are presented which are either improved by composite-laminating, or by installation of an extra composite-made internal r

    Characterization of MDF reinforced with Al2O3 Nano particles considering physical, mechanical and quasi-static properties

    Sadaf Karkoodi, Gholamhossein Liaghat, Hamid Zarea Hosseinabadi, Hamed Ahmadi
    Journal PapersWood Material Science & Engineering , 2020 May 26, {Pages 11-Jan }

    Abstract

    The paper investigates the addition of Nano-Al2O3 powder (alumina, Average Particle Size: 20 nm) on the characteristics of the Medium Density Fibreboards (MDF) made by the forest fibers. Some important physical, mechanical and quasi-static properties of the panels were measured according to the standard test methods and apparatus. Different percentages of alumina powder (0, 1, 2, and 3 weight percentage (wt.) based on the solid content of resin) were used and panels were made in three thicknesses (5, 10 and 14 mm). The experiments showed that the resultant properties of the new composites were improved. The greatest increase in Modulus of Elasticity (MOE) was achieved when 1% wt. alumina was added to the samples. Addition of alumina up

    Energy absorption study of a new reinforced top-hat section beam under flexural loading

    Nima Zahedan, Hamed Ahmadi, GholamHossein Liaghat
    Journal PapersInternational Journal of Crashworthiness , 2020 November 10, {Pages 16-Jan }

    Abstract

    The aim of this study is to investigate the improvement in energy absorption of a top-hat profile hollow-section beam by attaching different shapes of internal reinforcements. The base structure of the beam was first considered as a hat shape structure which was jointed to a flat plate using spot-welds. Three types of sheet metal reinforcements were formed and attached inside the beam’s structure. Then, they were tested experimentally under quasi-static three-point bending loading condition. Also, these reinforced structures were numerically simulated using LS-DYNA explicit code. After the numerical simulation is validated using experimental data, some new cross-sections were proposed for reinforcing component, and the specim

    Experimental and numerical investigation of the impact response of elastomer layered fiber metal laminates (EFMLs)

    A Taherzadeh-Fard, G Liaghat, H Ahmadi, O Razmkhah, SC Charandabi, ...
    Journal Papers , , {Pages }

    Abstract

    Experimental and numerical investigation on bending strength of the vehicle bumper beam with internal stiffeners

    N Zahedan, H Ahmadi, S Atashafrooz, M Baghaeian
    Journal Papers , , {Pages }

    Abstract

    High velocity impact on composite sandwich panels with nano-reinforced syntactic foam core

    H Ahmadi, G Liaghat, SC Charandabi
    Journal Papers , , {Pages }

    Abstract

    Experimental and Numerical Investigation of Energy Absorption in Auxetic Structures under Quasi-static Loading.

    M Najafi, H Ahmadi, GH Liaghat
    Journal Papers , , {Pages }

    Abstract

    Experimental and numerical investigation on crushing of metal-composite hybrid energy absorber under a quasi-static loading

    M Tayyebati, H Ahmadi, G Liaghat
    Journal Papers , , {Pages }

    Abstract

    Analytical and experimental investigation of transverse loading on grid stiffened composite panels

    Hamed Ahmadi, Gholamhossein Rahimi
    Journal PapersComposites Part B: Engineering , Volume 159 , 2019 February 15, {Pages 184-198 }

    Abstract

    This paper investigates the behavior of grid stiffened composite panel (GSCP) subjected to transverse loading by analytical and experimental approach. An improved analytical model is proposed on the basis of smeared method to compute an equivalent stiffness matrix for the isogrid lattice of the GSCP. Hence, the panel can be considered as a laminate with different layers of specific stiffness. In this manner, the global deformation of GSCPs is studied in three types of transverse loading: three-point bending, quasi-static indentation and low-velocity impact. The model is verified by the same experimental tests on some fabricated glass/epoxy GSCPs. The results indicate the good compatibility of analytical model with experiments. Moreover, ene

    Impact response of Kevlar/rubber composite

    A Khodadadi, G Liaghat, H Ahmadi, AR Bahramian, O Razmkhah
    Journal Papers , , {Pages }

    Abstract

    Experimental Study on the Effect of Pentanediol as a Chain Extender on the Mechanical Properties of MDI Polyurethane Foams

    I Nateghi-Boroujeni, G Liaghat, H Ahmadi
    Journal Papers , , {Pages }

    Abstract

    Experimental and numerical analysis of high velocity impact on Kevlar/Epoxy composite plates

    A Khodadadi, G Liaghat, H Ahmadi, AR Bahramian, D Shahgholian, ...
    Journal Papers , , {Pages }

    Abstract

    Experimental and numerical investigation on the effect of projectile nose shape in low-velocity impact loading on fiber metal laminate panels

    H Ahmadi, M Ekrami, H Sabouri, M Bayat
    Journal Papers , , {Pages }

    Abstract

    High velocity impact behavior of Kevlar/rubber and Kevlar/epoxy composites: a comparative study

    A Khodadadi, G Liaghat, AR Bahramian, H Ahmadi, Y Anani, S Asemani, ...
    Journal Papers , , {Pages }

    Abstract

    Numerical and experimental study of impact on hyperelastic rubber panels

    A Khodadadi, G Liaghat, H Ahmadi, AR Bahramian, Y Anani, ...
    Journal Papers , , {Pages }

    Abstract

    Characterization of compressive behavior of PVC foam infilled composite sandwich panels with different corrugated core shapes

    SA Taghizadeh, A Farrokhabadi, G Liaghat, E Pedram, H Malekinejad, ...
    Journal Papers , , {Pages }

    Abstract

    Analysis of low velocity impact on nano-beam using modified couple stress theory

    Mehran Ghalami-Choobar, Amar Bayat, Gholam Hossein Liaghat, Hamed Ahmadi
    Journal PapersModares Mechanical Engineering , Volume 17 , Issue 12, 2018 February 15, {Pages 42-46 }

    Abstract

    In this paper, low velocity impact on nano-beam using couple stress theory was investigated. Modified couple stress theory was utilized to capture size-dependent effects. Hamilton’s principle was employed to derive governing equations and boundary conditions and then general solution was proposed. The solutions validity was confirmed by comparing present results with that of the literature. Comparing the results shows the present theory is capable to predict low velocity dynamic behavior with acceptable accuracy. The results show as mass ratio increased, natural frequencies decreased and then trend to a constant value. This limit is higher for second and third natural frequencies. Also, the natural frequencies increased when characteristi

    Static analysis of highly anisotropic laminated beam using unified zig-zag theory subjected to mechanical and thermal loading

    Mehran Ghalami-Choobar, Gholamhossein Liaghat, Mojtaba Sadighi, Hamed Ahmadi, Omid Razmkhah, Akbar Aboutorabi
    Journal PapersInternational Journal of Mechanical Sciences , Volume 141 , 2018 June 1, {Pages 491-501 }

    Abstract

    In the present study, static behavior of short hybrid laminate beams was investigated using a unified zig-zag theory (ZZT) containing various beam theories as special cases. This theory satisfies transverse shear stresses continuity in the interface of layers via piece-wise continuous arbitrary shape functions. The principle of virtual work was employed to derive unified equilibrium equations and suitable boundary conditions. The present theory obviates the need for stress recovery for continuous transverse stresses. A general solution was presented to analyse high transversely anisotropic laminates under several kinds of transverse loads (general lateral, sinusoidal and point load) and non-linear thermal loads. The validity of this model i

    Simulation of crushing performance of Composite Energy Absorber under impact loading using Continuum Damage Mechanics approach

    Mahdi Ebrahimkhani, Gholamhossein Liaghat, Hamed Ahmadi
    Journal PapersModares Mechanical Engineering , Volume 17 , Issue 12, 2018 February 15, {Pages 505-513 }

    Abstract

    This paper details the experimental testing and numerical simulation of crushing performance of laminated composite tube under impact loading. Composite tube is modeled as multiple layers of shell elements and chamfered trigger is accounted for by sequentially reducing the length of the layers. The simulation is performed using a Continuum Damage Mechanics material model for representing the intralaminar behavior in which damage activates according to LaRC03-04 failure criteria and propagates according to a set of linear and bi-linear softening laws. Mesh objectivity is accounted for by incorporating crack band law and regularizing dissipated energy by element characteristic length. Interlaminar fractures are modeled using Tiebreak contact

    /pro/academic_staff/h_ahmadi/publication

    دروس نیمسال جاری

    • دكتري
      مكانيك ضربه اي (1) ( واحد)
      دانشکده مهندسی مکانیک، گروه طراحي كاربردي
    • كارشناسي ارشد
      مكانيك ضربه اي 1 ( واحد)

    دروس نیمسال قبل

    • كارشناسي ارشد
      مكانيك ضربه اي 2 ( واحد)
      دانشکده مهندسی مکانیک، گروه طراحي كاربردي
    • كارشناسي ارشد
      رفتار مكانيكي مواد ( واحد)
    • 1399
      جعفري , محمد
      تحليل تجربي و عددي جذب انرژي سازه هاي فلزي استوانه اي جدار نازك چند سلولي هم مركز پر شده با فوم
    • 1400
      دوستيارتبريزي, محمد
    • 1400
      عاكف, رضا
    • 1400
      كريمي كرهرودي, مريم
    • 1399
      نوروزي, محمد
      تحليل تئوري، تجربي و عددي رفتار پانل ساندويچي با هسته آگزتيك سه بعدي و رويه هاي كامپوزيتي تحت ضربه سرعت پايين
      داده ای یافت نشد
      داده ای یافت نشد

    مهم

    جدید

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