This paper addresses the brittleness of high-performance steel-fiber-reinforced concretes (HP-SFRCs) under compression by mean of Weibull modulus, which characterizes the defect distribution in the materials. The sizes of compressive specimens were used as follows: 70.7×70.7×70.7, 100×100×100, 150×150×150 mm 3 (cubes) and Ø100×200, 150×300 mm 3 (cylinders).

 9 p hcmute 06/06/2019 196 2 Download

In this study, we announce the experimental results of the position control of the hydraulic motor controlled by proportional valve. In the reseach model, we include the oil elasticity, and the friction and mas momentum intertia on hydraulic motor shafts and ball - screw mechanism are considered to be rigid. The proportional valve control circuit is Arduino uno R3, the fuzzy PID controller is programmed using the IDE software.

 9 p hcmute 06/06/2019 352 2 Download

Newly developed prous ceramics were sintered with extremly high porosity of about 50% and small pore size of about a few micrometrs. The new porous ceramics have incredible new applications. One example of them is vacuum vise, which can grip plates without covering total area of vise.

 6 p hcmute 06/06/2019 201 2 Download

In the last several decades past , Helicopters UAVs ( Unmanned Aerial Vehicles ) have quickly developed and day by day, they play an inportant role in human life. As it is well - known, helicopters UAV make some outstanding characteristics such as light weight, flexibility and particularly automatically controlled. By applying these characteristics, we research and manufacture Helicopter UAV using for spraying pesticide in agriculture.

 10 p hcmute 06/06/2019 412 2 Download

In operations research, it is really necessary to organize and arrange works including workers and machines into stations so that this combination is reasonable and assure the delivery time, quality and cost. This activity is know as line balancing - which is a regular work which is usually carried out by industrial engineers in the assembly companies and factories with the aim of improving the productivity and reducing production cost as...

 7 p hcmute 06/06/2019 381 4 Download

Trong nghiên cứu này, phôi thô thử kéo in 3D kim loại được tạo bằng phương pháp hàn đắp – MAG kết hợp máy phay CNC, với cùng thông số hàn nhưng khác hướng hàn: “Hướng song song với đường hàn”, “Hướng vuông góc với đường hàn”, “Hướng tiếp tuyến với đường hàn”.

 5 p hcmute 23/05/2019 508 4 Download

Trục vít ép máy ép củi trấu có tuổi thọ thấp do ma sát giữa đầu trục vít ép và vỏ trấu trong quá trình ép đùn thanh củi trấu. Qua khảo sát, trục vít bị mòn nhanh ở phần ép là phần có bước ren thay đổi.

 9 p hcmute 23/05/2019 522 4 Download

Nhu cầu sử dụng các chi tiết máy và các sản phẩm được chế tạo từ hai hoặc nhiều phần vật liệu ngày càng tăng nhờ chi phí vật liệu thấp, gia công khá dễ dàng mang lại tính cạnh tranh cao. Trong bài báo này chúng tôi giới thiệu các kết quả nghiên cứu quy trình hàn hai vật liệu thép C45 - SKD61 theo tiêu chuẩn AWS D1.1 – 2015 với vật liệu đắp là...

 7 p hcmute 23/05/2019 493 4 Download

This book will not how to openrate your machine. That is a wholly separate book in itselt, best left to those who do that sort of thing. This book attempts to give the reader a better understanding of what EDM is and how it works. Only after know-ing and understanding this can you make EDM work for you. Only if you understand its theory can you practice it, and only then can you know the premise within which it operates and, in turn understand...

 7 p hcmute 21/05/2019 356 6 Download

Machining processes produce finished parts, ready for use or assembly, at high degree of accuracy and surface quality by removing a certain machin-ing allowance from the workpiece material. The removal of material can be achieved by cutting, abrasion, and erosion. Nonconventional machining by erosion of the workpiece material regardless of their mechanical prop-erties has emerged to tackle problems associates with cutting or abrasion...

 25 p hcmute 21/05/2019 514 8 Download

Metal cutting is one ofe the most important methods of removing unwanted material in the production of mechanical components. This treatment identifies the major problem areas and relates observed performance to fundamentals of physics, chemisty, materials behavior, and the engineering sciences of heat transfer, solid mechanics, and surface science.

 20 p hcmute 20/05/2019 474 5 Download

With rapid advances in all aspects of manufacturing, the authors continue to present an up to date, comprechensive, and balanced coverage of the science, engineerings, and technology of maufacturing processes and operetions. As in previous editon editions, this text maintains the same number of chapers while continuing to emphasize the complexity and betwen matericals, design, and manufacturing processes, and the numerous factors involved in...

 19 p hcmute 20/05/2019 940 6 Download