118 research outputs found
Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
No full textMultiple cracks with different or similar geometries that coexist on the same plane will affect its neighbouring counterpart’s Stress Intensity Factor (SIF) value due to
interaction effect. The interaction effect is much related to the change of stress
distribution profile that produced by neighbouring crack. The study had been proven true over the past years through various Finite Element Analysis FEA software
packages and formulation, but an actual experiment and raw data acquisition is rather scarce in literature. This could well mean that the process to prepare multiple cracks study is hard to emulate physically as oppose to single crack study. The main intention
of this study attempts to simulate and find a possibility to replace subsequent crack
interaction to primary crack with kerf, incise in Electric Discharge Machining (WEDM)
wire cut, by evaluating the longitudinal stress distribution component. Current regional
technology of WEDM permits kerf gap machining at 0.050mm. This research, focuses
on emulating two parallel edge cracks’ interaction as initial attempt to prove that kerf
provides similar interaction on primary crack’s SIF. Through simulation using
ABAQUS Computer Aided Engineering (CAE), values of non-uniform stress
distributions produced by kerf within the potential primary crack region was analysed
and compared to non-uniform stress distributions that produced by a crack as validation.
Absolute error tabulation of stress distribution that produced by kerf suggests that it is
fit to replace subsequent crack for further study of interaction in multiple cracks. A nonconventional
method to determine Normalised SIF of crack, , using Multiple
Reference State (MRS) Weight Function was chosen given its capability in complex
computation of crack geometries that includes non-uniform stress distribution values in
finite bodies. The values from FEA models of double edge cracks which were used
as reference points exhibits decent agreement with data trend line from those conceived
by MRS Weight Function Method. Experiments are carried out with three (3)
specimens, made from Aluminium Alloy 6063 T6, which contains a crack, a, at varying
length and 10mm kerf, b, each at similar edge surface at similar separation of 10mm to
observe further growth of crack under presence of kerf. The three conditions of the
specimens are designed as followed; i) a≈b, ii) a=1.5b, and iii) a=2b. This is to
highlight the existence of interaction between crack and kerf under circumstance where
primary crack at different conditions attempts to grow under loading. This research
contributes the knowledge of kerf’s non-uniform stress distribution trend under tension
loading and its influence to primary crack’s growth in which the results are comparable
to those produced by subsequent crack. The study of kerf in this research is significant
as it disclose characteristic of kerf and crack interaction and allows anticipation in the
events structural failure for engineers and research in order to avoid potential disasters
The effect of material properties variation on clipper cutter life
No full textAccess is limited to UniMAP community.The effect of material properties variation on clipper cutter life onto the cutter that
provided by the Covidien Company were evaluated and compared. The material
and mechanical properties of the Sample A, Sample B and Sample C were
characterized and analyzed using several complementary techniques. Material
properties which are the material composition and microstructure of the samples
were analyzed by using Scanning Electron Microscope (SEM) and Energy
Dispersive X-ray Spectroscopy (EDS). Results show that due to the existing of
the large amount of element Fe, the samples can be classified as steel. With the
present of the 0.9%~1.5% of carbon, the three samples can be also classified as
high carbon steel. It shows that the Sample B is the hardest due the highest
amount of carbon. The other elements, zinc, aluminum and copper that are
observed from the samples increase their hardness, strength and improve the wear
resistance. Mechanical properties were measured using Rockwell Hardness test.
Result shows that the Sample B, 124.9HB is the hardest among three samples
Finite element analysis of screw threaded connections under bending
No full textAccess is limited to UniMAP community.A screw also known as fastener is used to connect two or more the various parts of
an assembly together. This study focuses on bending analysis of screw thread connection
with nut having size M12 for the application at road barrier stand .Analytical method of
finite element was used in this analysis through CATIA's software. The suitable mesh found
from the convergence study was 0.5mm, and then the value was in the analysis to seek out
bending stress in the screw thread connections with nut that are normally used at road
barrier stands. From the analysis result, bending stress equal to 2.41x108N/m2 occurred at
the connections with maximum load equal to 240 Newton. Then the improvement design of
the screw thread connection had been made to reduce stress that happened at angle between
thread. Result from improvement design of screw thread connections, shows that the stress
value obtained is 2.37x108 N/m2 with the same load applied. In conclusion the bending
stress at screw thread connection is reduced after improvement of the design has been done
Design of a mini fatigue bending test machine
No full textAccess is limited to UniMAP community.This project focuses on the design and development of science and technology. Mini
Bending Fatigue Testing Machine is developed based on the problem of the high cost of
providing these machines in large quantities. In addition, this machine also to help the
students to carry out the experiment or the test of whether learning materials in the
classroom, a final year project and integrated project. The objective of this machine must be
designed based on the design that is able to get power cycle the number of data and read the
force applied to achieve the goal of the experiment. This machine is designed in a small
size and easy to install and can carry out tests on samples of the material that has low stress
values and the small component parts of machine. Moreover, another objective is to
analyze the mechanisms and analysis of mechanical, mechatronics, mechanical components
and machine solid simulation design to ensure the successful functioning engine and
achieve objectives. Technical drawings are created using computer aided drawing software
to draw the CATIA product. After that, it was simulated to see the movement of the
machine and make analysis of critical machine parts such as the part easy to broken. Force
analysis to measure force at any position of angle, displacement, velocity and acceleration
slider also calculated Development of the design, institution, universities or others, can use
this machine in the laboratory because this machine is designed with low cost. Many
institutions only provide a universal testing machine (UTM), this machine is not used for
fatigue testing machine is even able to run a variety of tests. So, mini fatigue bending test
machine is suitable for recommendation to the institution or the student for the future
Synthesis, characterization and biological activity of NitrogenOxygen-Sulfur (NOS) transition metal complexes derived from novel s-2,4-dichlorobenzyldithiocarbazate with 5-fluoroisatin / Mohd Abdul Fatah Abdul Manan ... [et al.]
No full textA novel Schiff base containing nitrogen-oxygen-sulfur (NOS) donor atoms formed from the condensation reaction of S-2,4dichlorobenzyldithiocarbazate (S-2.4BDTC) with 5-fluroisatin has been synthesized. Complexes of cobalt(ll), nickel(ll), copper(ll), zinc(ll) and cadmium(ll) with this Schiff base have been prepared and characterized using elemental analysis and various physico-chemical techniques. In the cobalt(ll) andnickel(II) complexes the SchifJbase behaves as a uninegatively charged tridentate nitrogen-oxygen-sulfur (NOS) chelating ligand, bonding through the azomethine nitrogen, thiolate sulfur and carbonylic oxygen of the isatin moiety. However. in the copper(ll), zinc(II) and cadmium(II) complexes the Schiff base behaves as a nitrogen-sulfur (NS) bidentate chelating ligand, bonding through the azomethine nitrogen and thiolate sulfur. The Schiff base and the metal complexes were evaluated with respect to antimicrobial activity, which was performed in reallion to two selected pathogenic microbials (Bacillus subtilis and Pseudomonas aeruginosa). It was observed that only the zinc Schiffbase complex exhibited strong activity against the Bacillus subtilis bacteria with an inhibition zone of 25 mm
Digitalisasi Karya TGKH. Muhammad Zainuddin Abdul Madjid berbasis mobile sebagai media pembelajaran interaktif untuk pelestarian peninggalan pendiri Nahdlatul Wathan
No full textABSTRACTTGKH. Muhammad Zainuddin Abdul Madjid is a charismatic scholar on the island of Lombok and is the founder of Nahdlatul Wathan, the largest organization in West Nusa Tenggara. The works of Maulana Shaykh TGKH. Muhammad Zainuddin Abdul Madjid, like his books is a practice that routines are read by students and santriwati even the Nahdlatul Wathan congregation, as prayers and lessons that are practiced every time they finish worship and at critical times. Maulana Shaykh TGKH. Muhammad Zainuddin Abdul Madjid has many santri and santriwati in West Nusa Tenggara, even the archipelago under the Nahdlatul Wathan organization who faithfully practice his teachings and even his advice. Problems arise when his students are constrained by distance and time who want to read the books of his teacher. Therefore the author provides a solution with the Digitization of TGKH Works. Muhammad Zainuddin Abdul Madjid is based on mobile as an interactive learning medium for the preservation of the legacy of the founder of Nahdlatul Wathan. That will help his students who in fact do not have the book and are hindered by distance and time. Work begins with typing the contents of the book, followed by the implementation of the application, and in the end the application can be further utilizedDOI : 10.29408/jit.v2i1.94
PERAN KEPEMIMPINAN KEPALA MADRASAH DALAM MENGEMBANGKAN BUDAYA MUTU
No full textThe world is undergoing rapid and global changes. Therefore, in the era of globalization, quality of human resources is needed. The thing that needs to be considered in improving the quality of madrasas is building a quality culture of madrasas. The headmaster of the madrasah provides an important role in the formation of a strong madrasa culture.
This study aims to: (1) Obtain a description of the steps of the headmaster of the madrasah in developing the madrasah quality culture, (2) to know the Quality Culture Reality of Madrasah.
This research shows that (a) the head of the madrasah articulates the vision and mission for the effectiveness of his leadership in bringing madrasah to become culturally quality continuously. (b) The head of the madrasah has leadership values that are believed, and then realized into the life of the madrasah organization, and has an impact on efforts to improve the quality culture of madrasah. For the process of developing a quality culture through four phases, they are the preparation phase, the acceptance phase, the implementation phase and the commitment phase
Internalisasi Nilai-nilai Karakter dalam Meningkatkan Kompetensi Kepribadian Guru di SMP Ibrahimy 1 Sukorejo Situbondo
No full textUndang-undang No. 20 th2003 (Sisdiknas, Chapter 3) national education serves to develop the ability to form character and developing era nation dignity in the framework of the intellectual life of the nation that aimed to develop of potential participants students in order to become human of faith and pious to God Almighty, noble moral, healthy, intellectual, excellence, creative, independent and become citizens of a democratic and responsible. Mandate of the act is one of the basic that should be done. Some of the characters make up at junior high school of Ibrahimy 1 Sukorejo at Situbondo, a stable, mature personality, discipline, wisdom, authoritative, model for learners and the noble moral. As for the process of internalization are through Coaching and conditioning routine, reward, punishment, rules of the Foundation, Call (persuasive), and the creation of an atmosphere of Islamic (religious)
Daya Tahan dan Eksistensi Pesantren Di Era 4.0
No full textPesantren as one of the religious education institutions that are the womb of the prospective Muslim scholars, they also have a mandate to carry out educational missions based on Article 1 (1) of Law No. 20 of 2003 namely developing the potential of students to have religious spiritual power, self-control, personality, intelligence, noble character and skills needed by him, society, nation, and state. Era of Industrial Revolution 4.0 (here in after: Era 4.0) has an unimportant impact. It affects all aspects of human life. Included in this case is education. This era is characterized by the increasingly central role of cyber technology in human life. So do not be surprised if in the world of education the term "Education 4.0" appears. Availability of various information is born from the 4.0 digital revolution makes everyone able to access knowledge without being limited by space and time, therefore the pesantren curriculum continues to be encouraged to be contextual to the needs of the times, but on the other hand the pesantren is still able to maintain its identity as guardian of tradition. Efforts that can be developed in Islamic boarding schools in the era of 4.0 include building digital literacy in Islamic boarding schools and creating Islamic study channels
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