Crack behavior of heat treated sintered steel under cyclic loading / Al Emran Ismail

Fatigue crack nucleation and initiation at particles or defects in materials have been the interest of many researchers over the past years . This is because the understanding of theses phenomena would provide a better understanding of production of new fatigue resistanc e materials. In this study a test was developed to evaluate the fatigue properties and to observe fatigue crack nucleation and initiation in sintered steel. The fatigue test was carried out on polished specimens which was based on plate bending gives balanced biaxial tension. The experimental results shows that there were mixed mode of crack nucleation and initiation such that most cracks initiated at the interface of particles and matrix especially at high stress values . Cracks were also observed to initiate at voids and beneath the surface. Quenched specimens which were tempered between temperature range of 300°C and 600°C shows similar crack initiation mechanisms. The significant differenc e between as-rece ived and tempered specimens was that the number of cycles to fail due to di fferences in material hardne ss and internal defect s. The result s of the experimentation are discussed in the light of possible micro crack toughening at the crack tip and the presence of residual stresses due, to temperature changes. It is believed that some effects of residual stresses at the surface and beneath playa role in the nucleation of crack in sinter ed steel

Mode I Stress Intensity Factors of Sickle-Shaped Surface Cracks in Round Bars

Nowadays, the sickle-shaped surface crack generally occurred around the bolt under tension due to the stress concentrations occurred at the design discontinuitiesThe behaviors of these cracks are not really understood and additionally it is hard to find the solutions of stress intensity factors of this kind of cracks. Therefore, the intention of this paper is to present the behavior of these cracks under tension loading. In order to understand the role of these cracks, there are seven crack aspect ratios, a/b are considered ranging from 0.0 to 1.2. For each crack aspect ratio, there are six relative crack depth, a/D are used ranging from 0.1 to 0.6. There are two types of loading are used so called free- and fix-stresses. ANSYS finite element program is used to model the crack. Stress intensity factor (SIF) which is based on the J-integral is used to characterize the cracks. For relatively shallow cracks (a/D ≤ 0.3), the role of SIFs along the crack front is insignificant where the values of SIFs remain flattened along the crack front as a/D increased. However, for the deeper cracks (a/D > 0.3), the effect of a/b is pronounced on the SIFs. If a/b is increased from 0.0 to 1.2, higher SIFs are obtained within the central compared with the outer regions. This is due to the fact that the circumferential crack at the both sides of the bar experienced lack of mode I opening mechanism compared with the crack faces of the upper side cracks. It is also found that the SIFs obtained under free tension stress is higher that the SIFs under fix stress due to the fact that free stress condition capable to induce the bending moment effect and therefore widening the crack faces

Editorial Preface

It is with great pleasure that we present the 3rd issue of Volume 9 of the International Journal of Integrated Engineering (IJIE). This edition features the latest findings and research in the area of Civil and Environmental Engineering, Electrical and Electronic Engineering and Mechanical, Materials and Manufacturing Engineering.This issue contains eleven articles. The first article proposed a new solution, named RRFAST, to overcome rerouting problem of FAST TCP. The second article aimed to study and assess the diameter and displacement of the carotid arterial wall movement from B-mode ultrasound image for the early detection of atherosclerosis. The third article presented a Multi-Criteria Decision Making (MCDM) tool for prioritising alternative solutions to power generation problems. The fourth article focused on determining the characteristics of the spray produced in the simulation of spray biodiesel using constant volume chamber by using computational fluid dynamic (CFD). The fifth article presents a development of a temperature control system by means of the proportional controller to control the temperature inside the mini container during the NIRS data acquisition process. In the sixth article, the authors developed a single phase inverter that is used to understand the concept of inverting voltage output control using Raspberry Pi as the microcontroller. In the seventh article, the authors present their finding on the capability of peat soil (PS) and activated carbon (AC) as a potential composite adsorbent for the removal of colour and Fe from a stabilized landfill leachate. The eighth article presents the design and development of a simple and low cost interactive rehabilitation module for stroke patients. In the ninth article, the authors share their findings on the combination of Charge-Coupled Device (CCD) and laser diode with LabVIEW software on Optical Tomography System (OTS) for monitoring multiphase flow. In the tenth article, the authors examined the effect of different spatial filters performance towards mammogram de-noising. In the last article, the authors report on the efficiency of coagulation and flocculation process in the removal of suspended solids, colour, Chemical Oxygen Demand (COD) and Oil and Grease using ferric chloride and ferric sulfate for the treatment of biodiesel wastewater.We would like to extend our sincere gratitude and appreciation for the enthusiastic and vigorous support and contributions from the Editorial Board and Reviewers of IJIE for taking time and effort to review manuscripts. As no manuscript is accepted or rejected without careful reading by experts in a particular area to which the paper is related. The experts have maintained a high standard of scholarship and we believe the readers of this Journal deserves.It is our hope that this fine collection of articles will be a valuable resource for International Journal of Integrated Engineering (IJIE) readers and will stimulate further research in the area of Civil and Environmental Engineering, Electrical and Electronic Engineering and Mechanical, Materials and Manufacturing Engineering. We strongly encourage authors to submit their articles and readers to provide feedback. In order to access the online version of this issue along with archived editions please visit our website http://penerbit.uthm.edu.my/ojs/index.php/ijie/. We would like to thank all the authors who have contributed manuscripts in IJIE and those who are awaiting their manuscripts for publication in subsequent issues

Editorial Preface

The 11th regular issue, number 8 is presenting the latest findings and research in the three major engineering field, namely, Civil and Environmental Engineering, Electrical and Electronic Engineering, and Mechanical, Materials and Manufacturing Engineering. The chief editors really appreciate support and contributions from the Editorial Board and Reviewers for making the process of selection of articles rigorous and meeting the high standard of scholarship that had been set. There are 31 articles were selected to be published in this issue, which reflects the niche of IJIE. Hopefully, the articles will provide additional information and contribute to the development of the engineering field. The chief editors strongly encourage authors to submit their articles and readers to provide feedback. Any comment for improvement is really appreciated.  Please visit IJIE website http://penerbit.uthm.edu.my/ojs/index.php/ijie/ to access the online version of this issue along with archived editions. The chief editors also would like to thank all the authors who have contributed manuscripts in IJIE and those who are awaiting their manuscripts for publication in subsequent issues

Editorial Preface

This special issue of International Journal of Integrated Engineering provides deep research on Future Technology Towards a Smart and Healthy Society, contains 30 papers contributions by more than 50 authors from various institutions. This special appreciation goes to all Editorial Team members and also Guest Editorial Team members for the evaluation process with strict comments to improve the quality of the content. Generally, the area covered in this special issue is focus on future technology by proposing numbers of novel techniques especially health monitoring system, health assessment and power system techniques towards clean and better society including weather classification method. The goal of this special issue is to present and provide platform of various engineering field results, thus it is believed that the papers will be the good references and bring directions to researchers in their research discipline

Editorial Preface

It is a pleasure to present the first special issue of mechanical engineering for the year 2019. All manuscripts received by the editors were examined by referees instructed to evaluate the papers by the significance and novelty. There are 30 papers published in this issue came from various countries such as Malaysia, Indonesia, Japan, Thailand and industry. Most of the papers discussed in the aspect of mechanical engineerings such as welding technology, computational fluid dynamic, materials and industrial engineering. Many thanks to all contributors and reviewers for their participation in making this issue can be realized

Editorial

This special issue of International Journal of Integrated Engineering provides deep research on Mechanical Engineering, contains 30 papers contributions by more than 50 authors from various institutions. Theses papers are selected from three occasions held in 2018 such as International Conference on Mechanical and Manufacturing Engineering (ICME2018), Symposium on Damage Mechanisms in Materials and Structures (SDMMS2018) and International Conference and Symposium on Occupational Safety and Health (ISOSH2018). This special appreciation goes to all Editorial Team members and also Guest Editorial Team members for the evaluation process with strict comments to improve the quality of the content

Editorial Preface

This is the first volume of year 2018 which contained of three main engineering fields such as Mechanical and Manufacturing, Civil and Environmental and Electrical and Electronic Engineering. In this volume there are 30 number of papers published and indexed mainly in SCOPUS, GOOGLE SCHOLAR and Malaysia Citation Centre (MCC). It is about 30% of these papers came from international authors and the number is growing. Editorial board and the Penerbit UTHM would like to express their appreciation to national and international authors who have contributed their work to the world of knowledge. Lastly, we would also like to thank all reviewers who make the supportive reviews, comments and suggestions in order to enhance the quality of this journal. In order to access the online version of this issue along with archived editions please visit our website http://penerbit.uthm.edu.my/ojs/index.php/ijie/

Editorial Preface

It is a great pleasure that we present the 11th special issue with a number of 7 of the International Journal of Integrated Engineering (IJIE). This edition features the latest findings and research in the areas related to Mechanical Engineering and its application. We would like to extend our sincere gratitude and appreciation for the enthusiastic and vigorous support and contributions from the Editorial Board and Reviewers of IJIE for taking time and effort to review the manuscripts.  As no manuscript is accepted or rejected without careful reading by experts in a particular area to which the paper is related. The experts have maintained a high standard of scholarship and we believe the readers of this Journal deserves. It is our hope that this fine collection of articles will be a valuable resource for International Journal of Integrated Engineering (IJIE) readers and will stimulate further research in the area of Mechanical, Materials and Manufacturing Engineering.  We strongly encourage authors to submit their articles and readers to provide feedback.  In order to access the online version of this issue along with archived editions please visit our website http://penerbit.uthm.edu.my/ojs/index.php/ijie/. We would like to thank all the authors who have contributed manuscripts in IJIE and those who are awaiting their manuscripts for publication in subsequent issues