Module 7 Suture materials and packaging

Not every recyclable material can be recycled efficiently. VWhich one below may not be one of the reasons for this? * In the case of widely distributed scrap, material contained in discarded products has to be collected, separated, and cleaned so that the economics is in the play. Some materials consist of large amount of impurities that the recycled materials cannot be used in place of a virgin material because of deterioration in material properties. Some materials cannot be separated from each other easily, i.e., fiber composites. The energy and emissions are higher for recycling processes of some materials than that of initial processes, and therefore, recycling may not be preferred depending on the material type.

Based on the table below, which of the statements below is/are correct regarding the 3D printing process shown in the schematic? Z AXIS X AXIS YAXIS LEGEND A: Extruder B: Nozzle C: Printed part D: Hot plate E: Filament Table 15.2 Melting and Glass Transition Temperatures for Some of the More Common Polymeric Materials Material Polyethylene (low density) Polytetrafluoroethylene Polyethylene (high density) Polypropylene Nylon 6,6 Polyester (PET) Poly(vinyl chloride) Polystyrene Polycarbonate Glass Transition Temperature [°C (°F)] -110 (-165) -97 (-140) -90 (-130) -18 (0) 57 (135) 69 (155) 87 (190) 100 (212) 150 (300) Melting Temperature [°C (°F)] 115 (240) 327 (620) 137 (279) 175 (347) 265 (510) 265 (510) 212 (415) 240 (465) 265 (510) a. This process is best suited for the low volume production of tubes, bars and beams due to the nature of the extrusion process b. Manufacturing a thermoplastic HDPE hose with an extrusion nozzle heated to 175C is possible with this process □c. You can…

Can you please answer these 3 questions from material engineering.....

materials, properties and testing  Describe the working and environmental conditions that lead to failure for a product made from material from each of the following categories: silicon nitride  fibreglass carbon fibre  steel

Thermal Analysis - Material Characterisation  State the 3 criteria that must be met to qualify a technique as thermal analysis

As a technologist, you are given the following design task: In a manufacturing environment, the final product needs to be packaged and sealed. After the product is placed inside the plastic bag, a hot pressing die is to be used to seal the plastic bag by application of heat and pressure. The operation should be as follow: By pressing a pushbutton switch, the heating rail is advanced and the packaging material is heated along the adhesive strip. After the adhesion pressure has been reached, the heating rail must return to its start position The design specification includes the following: Pressure dependent reversal with monitoring of the end position by means of magnetic proximity switches. Include safety measures, a green light to show when the system is ready, a red light when system is in operation, a warning sound when the heating rail is moving. 1. Draw your pneumatic circuit design for this application. 2. Draw the electric circuit diagram for your design.

Project 2: You have been asked to obtain an object/structure/component that has failed (It may come from your home, workshop, an automobile repair shop, a machine shop, and so on) and conduct an investigation to determine the cause and type of failure (i.e. simple fracture, fatigue, creep). What are the working and environmental conditions that causes the failure? In addition, propose measures that can be taken to prevent future incidents of this type of failure. After you have determined the failure type of your case study, your leader asked you to write shortly about the other mechanisms of failure.

Manufacturing process can be divided by 5 main groups with respect to their physical action on raw materials and some of them acquire a specific machine. They can be listed as: 1. Material deposition technologies, such as casting and sintering, or the new "rapid manufacturing" techniques developed rapidly in the last ten years. 2. Joining techniques, in which riveting, friction stir welding (FSW), welding and assembly are classified. 3. Forming, where hot working techniques like forging and cold working techniques such as forming, spinning and involute splines production are placed. 4. Material separation, including shearing, nibbling, punching, cutting by laser and cutting by high pressure water or abrasive waterjet (AWJ). 5. And finally material removal processes, also known as machining processes. Using 3D metal printing is falls under which catogary? O a. No. 5 O b. No. 4 O c. No. 2 O d. no. 1 O e. No. 3

8) Chapter 3: Problem 3.21: One of the inspectors in the quality control department has frequently used the Brinell and Rockwell hardness tests, for which equipment is available in the company. He claims that the Rockwell hardness test is based on the same principle as the Brinell test, which is that hardness is measured as the applied load divided by the area of the impression made by an indentor. Is he correct? If not, how is the Rockwell test different?

17

Minimum of 300 words

Choose one of the airplane part and based on that part answer the following questions for example the wing

Multiple choice questions, please help thank you!! 1. The chemical potential (μ) of smaller size clusters is bigger than that of bigger size clusters because of  (a) their small size  (b) the fewer number of atoms in them (c) surface area is smaller (d) their surface is more curved 2. Which of these characteristics would you associate with SEM: A surface imaging tool Maintained under vacuum Provides imaging and compositional data Uses a scanned electron beam All of the above   3. Secondary electrons (SE) are best described as Low energy electrons from the sample surface  High energy electrons from the sample surface  Low energy primary beam electrons  High energy primary beam electrons 4. Atomic force microscopy (AFM) is the most widely used form of scanning probe microscopes for the characterization of nanomaterials since it require: (a) electrically conductive and optically transparent samples (b) neither electrically conductive nor optically transparent samples (c) electrically…

What are the types of accident in industrial safety?  Examine some of the common source of mechanical hazards.  Organize the classification of pressure vessels.  Describe fault tree analysis.  What is the corrosion and its prevention?  What are the different types of wear and causes?  Enlist the points to be considered for safety in industries as per The Factories Act, 1948. What is lubrication and method of lubrication?   What is the concept and importance of fault tracing?  How do you draw a decision tree diagram?  What is periodic maintenance?  What are the steps in making preventive maintenance procedure?

Show the typical Stress versus Strain curve for the following materials, and define the materials properties "The stress-strain curve can be used to read off the structural load ability of materials. For many materials, including metals, their loading bearing capability is one of the most important material properties". by reference to the diagram: a) Hammer head is made from hardened tool steel b) Smelter is made from refractory ceramic c) Cable is made from pure copper d) Box is made from polypropylene

Provide a preventive measures for the incident case.  (Basic occupational health and safety engineering)

Plastic materials that soften and melt under exposure to heat and can reach a flowable state

for  fuselage of an aircraft product  What type of failure this product/part is exposed to? How to carry out the inspection and prevention of this failure damage? 8.Would there be any concerns relating to environment? Recycling? Product liability?

In the context of metal fatigue, which of the following statements best describes the phenomenon known as "endurance limit"?   A) The maximum stress a material can withstand before it undergoes plastic deformation. B) The stress below which a material can theoretically endure an infinite number of load cycles without failure. C) The residual stress remaining in a material after the removal of an external load. D) The stress at which a material experiences sudden catastrophic failure without any prior plastic deformation.

If a constant stress is applied and the strain is monitored with time for a viscoelastic material, which of the following is TRUE Select one: O a. Strain will always increase linearly as long as the stress is applied. b. Strain will increase as long as the stress is applied but rate of strain will change with time. c. If the stress is removed, the strain will instantaneously become zero. d. Strain will develop instantaneously and remain constant thereafter. e. None of these options

a) Answer the following true/ false questions. Each question is ) When one dimension of structure is much longer than the others, the strain in that direction can be negligible. ) Buckling is the critical failure mode when Euler beams are subjected to very larger compressive stress than the yield strength. ) Fatigue failure of the structure occurs due to the sudden impact load. ) The reliability of products always decreases with respect to time or cycles with constant failure rate. () For thin-walled pressure vessels, the stresses in the thickness direction can be negligible. ) The stress concentration occurs due to the geometric discontinuity but does not depend on the type of loads. ) Based on the fracture mechanics theory, the structural failure always occurs due to the presence of cracks or defects. () In general, failure of ductile materials occurs in the principle plane due to the principle stresses. () Ultimate strengths of brittle materials are always smaller than those of…

2. Sharp notches are often added to plastic food packages to help open them (along with arrows indicating where they should be torn). Why do they do this, and why is it sometimes very hard to open them without this notch? Would it be harder or easier to open with a semi-circular notch and why? YY (ENISH) TOMATO 10 ATE TOMATE CONCENTRATE FRO NUSARY Heins

The performance of a structural element is determined by the properties of the material the geometry functional requirements the microstructure

26)

Project 1: Reciprocating/internal combustion engines are widely used as a portable electrical generator in many commercial and industrial applications. You are required to describe the operation sequence of different types of available engines and explain their mechanical efficiency. You have been asked to deliver a detailed technical report and show your approach in solving and discussing the following: 1. By constructing simple sketch, show the properties and characteristics of reciprocating/internal combustion engine of both spark ignition (SI) and compression ignition (CI). You must indicate the following, in case they are existed: a. Piston-cylinder parts, Top dead centre TDC, Bottom dead centre BDC, and Clarence volume. b. Intake vale, Exhaust Valve, Spark plug, Stroke displacement, Bore dimeter. c. Show the complete cycle of ideal Otto and Diesel cycles by means of P-V and T-S diagrams, showing on them the input and output heat and net output work, process type (isentropic,…