The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform

Masaharu Iwamoto - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical and shape memory behavior of composites with shape memory polymer
    Composites Part A: Applied Science and Manufacturing, 2004
    Co-Authors: Takeru Ohki, Norihito Ohsako, Masaharu Iwamoto
    Abstract:

    Abstract Shape memory polymers (SMPs) are playing a prominent role for biomedical, self-repairing and smart materials. Among various SMPs, shape memory polyurethanes (PUs) are receiving much attention for their easy control of glass transition temperature (Tg) around the room temperature and excellent shape memory effect even at the room temperature. In this paper, the glass Fiber reinforced PUs were developed for the improvement of the mechanical weakness of PUs bulk and for wider practical engineering uses. The specimens with different Fiber weight fractions were fabricated and their mechanical behavior and shape memory effect were investigated. As a result, the tensile strength and the resistance against mechanical and thermal mechanical cycle loading in the developed materials increased due to the role of Reinforcement Fiber. It was shown there is an optimum Fiber weight fraction between 10 and 20 wt% to have an extremely low residual strain during cyclic loading. Although the shape memory effect of developed glass Fiber reinforced shape memory PUs composites was affected by glass Fiber weight fraction, it was confirmed that the shape memory effect was kept in the developed composite materials.

Takeru Ohki - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical and shape memory behavior of composites with shape memory polymer
    Composites Part A: Applied Science and Manufacturing, 2004
    Co-Authors: Takeru Ohki, Norihito Ohsako, Masaharu Iwamoto
    Abstract:

    Abstract Shape memory polymers (SMPs) are playing a prominent role for biomedical, self-repairing and smart materials. Among various SMPs, shape memory polyurethanes (PUs) are receiving much attention for their easy control of glass transition temperature (Tg) around the room temperature and excellent shape memory effect even at the room temperature. In this paper, the glass Fiber reinforced PUs were developed for the improvement of the mechanical weakness of PUs bulk and for wider practical engineering uses. The specimens with different Fiber weight fractions were fabricated and their mechanical behavior and shape memory effect were investigated. As a result, the tensile strength and the resistance against mechanical and thermal mechanical cycle loading in the developed materials increased due to the role of Reinforcement Fiber. It was shown there is an optimum Fiber weight fraction between 10 and 20 wt% to have an extremely low residual strain during cyclic loading. Although the shape memory effect of developed glass Fiber reinforced shape memory PUs composites was affected by glass Fiber weight fraction, it was confirmed that the shape memory effect was kept in the developed composite materials.

Norihito Ohsako - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical and shape memory behavior of composites with shape memory polymer
    Composites Part A: Applied Science and Manufacturing, 2004
    Co-Authors: Takeru Ohki, Norihito Ohsako, Masaharu Iwamoto
    Abstract:

    Abstract Shape memory polymers (SMPs) are playing a prominent role for biomedical, self-repairing and smart materials. Among various SMPs, shape memory polyurethanes (PUs) are receiving much attention for their easy control of glass transition temperature (Tg) around the room temperature and excellent shape memory effect even at the room temperature. In this paper, the glass Fiber reinforced PUs were developed for the improvement of the mechanical weakness of PUs bulk and for wider practical engineering uses. The specimens with different Fiber weight fractions were fabricated and their mechanical behavior and shape memory effect were investigated. As a result, the tensile strength and the resistance against mechanical and thermal mechanical cycle loading in the developed materials increased due to the role of Reinforcement Fiber. It was shown there is an optimum Fiber weight fraction between 10 and 20 wt% to have an extremely low residual strain during cyclic loading. Although the shape memory effect of developed glass Fiber reinforced shape memory PUs composites was affected by glass Fiber weight fraction, it was confirmed that the shape memory effect was kept in the developed composite materials.

M Misra - One of the best experts on this subject based on the ideXlab platform.

  • the effect of silane treated and untreated talc on the mechanical and physico mechanical properties of poly lactic acid newspaper Fibers talc hybrid composites
    Composites Part B-engineering, 2007
    Co-Authors: Masud S Huda, Lawrence T Drzal, Amar K Mohanty, M Misra
    Abstract:

    This paper evaluates the effect of the addition of silane treated- and untreated- talc as the fillers on the mechanical and physico-mechanical properties of poly(lactic acid) (PLA)/recycled newspaper cellulose Fibers (RNCF)/talc hybrid composites. For this purpose, 10 wt% of a talc with and without silane treatment were incorporated into PLA/RNCF (60 wt%/30 wt%) composites that were processed by a micro-compounding and molding system. PLA is utilized is a bio-based polymer that made from dextrose, a derivative of corn. Talc is also a natural product. The RNCF and talc hybrid Reinforcements of PLA polymer matrix were targeted to design and engineer bio-based composites of balanced properties with added advantages of cost benefits besides the eco-friendliness of all the components in the composites. In this work, the flexural and impact properties of PLA/RNCF composites improved significantly with the addition of 10 wt% talc. The flexural and impact strength of these hybrid composites were found to be significantly higher than that made from either PLA/RNCF. The hybrid composites showed improved properties such as flexural strength of 132 MPa and flexural modulus of 15.3 GPa, while the unhybridized PLA/RNCF based composites exhibited flexural strength and modulus values of 77 MPa and 6.7 GPa, respectively. The DMA storage modulus and the loss modulus of the PLA/RNCF hybrid composites were found to increase, whereas the mechanical loss factor (tan delta) was found to decrease. The storage modulus increased with the addition of talc, because the talc generated a stiffer interface in the polymer matrix. Differential scanning calorimetry (DSC) thermograms of neat PLA and of the hybrid composites showed nearly the similar glass transition temperatures and melting temperatures. Scanning electron microscopy (SEM) micrographs of the fracture surface of Notched Izod impact specimen of 10 wt% talc filled PLA/RNCF composite showed well filler particle dispersion in the matrix and no large aggregates are present. The comparison data of mechanical properties among samples filled with silane-treated- and untreated- talc fillers showed that the hybrid composites filled with silane treated talc displayed the better mechanical prosperities relative to the other hybrid composites. Talc-filled RNCF-reinforced polypropylene (PP) hybrid composites were also made in the same way that of PLA hybrid composites for a comparison. The PLA hybrid bio-based composites showed much improvement in mechanical properties as compared to PP-based hybrid counterparts. This suggests that these PLA hybrid bio-based composites have a potential to replace glass Fibers in many applications that do not require very high load bearing capabilities and these recycled newspaper cellulose Fibers could be a good candidate Reinforcement Fiber of high performance hybrid biocomposites.

Utama Maharioputro - One of the best experts on this subject based on the ideXlab platform.

  • Pengaruh Variasi Two Direction Pre-tension pada Reinforcement Fiber Komposit Matriks Polimer Vinyl Ester Terhadap Kekuatan Tekuk.
    2016
    Co-Authors: Utama Maharioputro
    Abstract:

    Perkembangan teknologi material telah melahirkan suatu material jenis baru yang dibangun beberapa lapisan. Material ini disebut material komposit. Material komposit adalah material yang tersusun oleh dua atau lebih material yang memiliki karakteristik berbeda. Tujuan penelitian adalah untuk mengetahui pengaruh variasi pre-tension 2 arah pada fibreglass Reinforcement panel komposit dengan matriks vinyl ester terhadap kekuatan tekuknya. Serat yang digunakan pada komposit adalah e – glass jenis woven roving dan resin Vinyl Ester. Pembuatan komposit menggunakan metode hand lay-up dengan variasi two direction pre-tension sebesar 0 N, 50 N, 60 N, 70 N, dan 80 N. Standar yang digunakan untuk pengujian bending adalah ASTM D 7264. Pengujian bending menggunakan Universal Testing Machine. Dari hasil penelitian pemberian two direction pre-tension memberikan pengaruh terhadap kekuatan bending. Pemberian two direction pre-tension sebesar 50 N memiliki kekuatan bending rata – rata sebesar 53,882 N/mm2. Variasi 60 N memiliki kekuatan bending rata – rata sebesar 61,361 N/mm2. Variasi 70 N kekuatan rata – ratanya 70,351 N/mm2. Kekuatan bending tertinggi berada pada variasi pre-tension 80 N dengan kekuatan rata – rata sebesar 84,288 N/mm2. Sedangkan kekuatan bending terendah berada pada variasi tanpa pre-tension dengan kekuatan bending rata – rata sebesar 37,436 N/mm2