In general, polymer composite materials are molded in solid form and avoid the occurrence of gas bubbles trapped in the matrix. The resulting material becomes rigid and does not have a good ability to absorb the load given. At this time, innovations in the field of composite materials have been carried out and produced polymer composite materials with foam-shaped structures that are able to reduce the load given. In this study, a composite foam material reinforced with PEBF fiber was tested with an impact dynamic load and the test results were numerically analyzed by the finite element method. The purpose of this study is to obtain the stress distribution at the fracture point due to the impact of dynamic loads at high strain rates with the finite element analysis method. Impact dynamic test using the Air Gun Compressor (AGC) test with an impact pressure of 0.2 – 0.8 MPa. Strain wave propagation in the test specimen was recorded using two strain gauges. Numerical analysis is carried out with the help of Msc. Nastran software. Experimentally, a failure in the specimen occurred at an impact pressure of 0.4 MPa and an impact distance (ID) of 500 mm. Strain wave propagation time in the specimen averaged 37.5 ms, at which time the tensile and compressive stresses intersected at a distance of about 120 to 155 mm from the starting point of loading. The magnitude of the stress distribution in the range of the fracture zone is between 800 to 900 MPa.
Sawit merupakan salah satu tanaman penghasil minyak sawit (Cruide Palm Oil) dan inti sawit (Palm Kernel) dan menjadi primadona tanaman perkebunan yang menjadi sumber devisa non migas bagi Indonesia. Salah satu proses terpenting untuk mendapatkan minyak kelapa sawit ada pada mesin screw press. Mesin ini berfungsi memeras buah sawit untuk mendapat minyak sawit. Mesin screw press ini sering terjadi kerusakan yaitu ausnya pisau press pada saat memeras buah sawit, hal ini disebabkan oleh faktor lama pemakaian, perawatan, dan material screw press. Penelitian ini dilakukan untuk mengetahui karakteristik material screw press dengan melakukan beberapa pengujian, menganalisa gaya dan tegangan pada screw press. Pengujian yang dilakukan adalah: uji tarik, uji kekerasan, struktur mikro, dan komposisi kimia. dimana dari hasil pengujian yang dilakukan didapatkan hasil yaitu: tegangan tarik sebesar 78 kg/mm2 , keuletan screw 4,64%, sementara berdasarkan standar dari material screw press tegangan tarik screw press adalah 100 kg/mm2. Pengujian kekerasan dari tiga titik pengujian pada salah satu titik kekerasannya berbeda. Sedangkan gaya tekan yang terjadi pada screw adalah sebesar 264 kN/m2, dimana besarnya torsi 85,50 kN.m2, dan tegangan aksial screw sebesar 336,13 kN/m2. Dari hasil uji yang telah dilakukan dapat disimpulkan besarnya selisih tegangan tarik spesimen uji dengan standar pabrik sangat jauh, serta kekerasan permukaan screw yang tidak sama sangat mempengarui tingkat aus pada material screw press.
This study aims to obtain results on the legal consequences of separation of assets in tax calculations and the principle of fairness for tax calculations in accordance with the provisions of the Director General of Taxes. The research method used is normative juridical by using testing techniques through a statutory approach as well as applicable legal theories, concepts and principles compared to the implementation in the field, especially about the method of calculating the separation of assets in accordance with the regulations of the Director General of Taxes and the calculation should be if in accordance with the marriage agreement for the separation of property. The research provides results if using the calculation method in accordance with tax regulations, the couple is still owed tax and / or greater even though each of them has been deducted from income tax and should be nil. And the principle of legal justice that should be obtained by the taxpayer of separation of property on the mechanism for determining taxable income by tax regulations is not to occur because with the deed of marriage agreement for separation of property made before a Notary which is an authentic deed, it should be from the beginning that from the beginning everything is separate including with his property, but for taxes it is not recognized the deed because the income is combined first.
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