Engineering Design and Analysis
Engineering Design and Analysis ENGIN 10
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This 4 page Class Notes was uploaded by Antonietta Beahan on Thursday October 22, 2015. The Class Notes belongs to ENGIN 10 at University of California - Berkeley taught by L. Pruitt in Fall. Since its upload, it has received 47 views. For similar materials see /class/226678/engin-10-university-of-california-berkeley in Engineering and Tech at University of California - Berkeley.
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Date Created: 10/22/15
Chien Hsinying KELLY 22448377 February 4 2011 E10 Spring 2011 Engineering Ethics TrueFalse Assignment Engineers in the ful llment of their professional duties must carefully consider the safety health and welfare ofthe public FALSE Engineers may perform services outside of their areas of competence as long as they inform their employers or clients FALSE Engineers may issue subjective and partial statements if such statements are in writing and consistent with the best interests of their employers clients or the public FALSE Engineers shall act for each employer or client as faithful agents or trustees TRUE Engineers shall not be required to engage in truthful acts when required to protect the public health safety and welfare FALSE Engineers may not be required to follow the provisions of state or federal law when such actions could endanger or compromise their employer or their clients39 interests FALSE If engineers39 judgment is overruled under circumstances that endanger life or property they shall notify their employers or clients and such other authority as may be appropriate TRUE Engineers may review but shall not approve those engineering documents that are in conf01mity with applicable standards FALSE Engineers shall not reveal facts datainformation without the prior consent of the client or employer except as authorized or required by law or this Code TRUE Engineers shall not permit the use of their names or associates in business ventures with any person or rm that they believe is engaged in fraudulent or dishonest enterprise unless such enterprise or activity is deemed consistent with applicable state or federal law FALSE Engineers having knowledge of any alleged violation of this Code following a period of 30 days during which the violation is not corrected shall report thereon to appropriate professional bodies and when relevant also to public authorities and cooperate with the proper authorities in furnishing such information or assistance as may be required FALSE Engineers shall undertake assignments only when qualified by education or experience in the specific technical fields involved TRUE Engineers shall not affix their signatures to plans or documents dealing with subject matter in which they lack competence but may affix their signatures to plans or documents not prepared under their direction and control where they have a good faith belief that such plans or documents were competently prepared by another designated party FALSE Engineers may accept assignments and assume responsibility for coordination of an entire project and shall sign and seal the engineering documents for the entire project including each technical segment of the plans and documents FALSE Engineers shall strive to be objective and truthful in professional reports statements or testimony with primary consideration for the best interests of the engineers39 clients or employers The engineers39 reports shall include all relevant and pertinent information in such reports statements or testimony which shall bear the date on which the engineers were retained by the clients to prepare the reports FALSE Engineers may express publicly technical opinions that are founded upon knowledge of the facts and 22 competence in the subject matter TRUE Engineers shall not issue statements criticisms or arguments on technical matters that are inspired or paid for by interested parties unless they have prefaced their comments by explicitly identifying the interested parties on whose behalf they are speaking and revealing the existence of any interest the engineers may have in the matters TRUE Engineers may not participate in any matter involving a con ict of interest if it could in uence or appear to in uence their judgment or the quality of their services FALSE Engineers shall not accept compensation financial or otherwise from more than one party for services on the same project or for services pertaining to the same project unless the circumstances are fully disclosed and agreed to by all interested parties TRUE Engineers shall not solicit but may accept financial or other valuable consideration directly or indirectly from outside agents in connection with the work for which they are responsible if such compensation is fully disclosed FALSE Engineers in public service as members advisors or employees of a governmental or quasi govemmental body or department may participate in decisions with respect to services solicited or provided by them or their organizations in private or public engineering practice as long as such decisions do not involve technical engineering matters for which they do not posses professional competence FALSE Engineers shall not solicit nor accept a contract from a governmental body on which a principal or officer of their organization serves as a member TRUE Engineers shall not intentionally falsify their qualifications nor actively permit written misrepresentation of their or their associates qualifications Engineers may accept credit for previous work performed where the work was performed during the period the engineers were employed by the previous employer Brochures or other presentations incident to the solicitation of employment shall specifically indicate the work performed and the dates the engineers were employed by the firms FALSE Engineers shall not offer give solicit nor receive either directly or indirectly any contribution to in uence the award of a contract by a public authority or which may be reasonably construed by the public as having the effect or intent of in uencing the award of a contract unless such contribution is made in accordance with applicable federal or state election campaign finance laws and regulations Engineers shall acknowledge their errors after consulting with their employers or clients FALSE 25 Engineers shall acknowledge their errors after consulting with their employers or clients FALSE Used this page for clear written list of code of ethics httpwwwnspeorgEthicsCodeofEthicsindexhtml 1 N E 4 Chien Hsinying KELLY 22448377 February 7 2011 E10 Spring 2011 Dr Alan Pelton s Lecture Questions What is Dr Alan Pelton s training Dr Alan Pelton received his PhD in Materials Science and Engineering from the University of California Berkeley then did postdoctoral research in the Department of Materials Science and Engineering at Stanford University He went on to accept a position at a lab then became assistant professor at the University of Notre Dame After that he accepted a position of Research manager and is now a well recognized person by many companies and the FDA At one point the Dr Alan Pelton and his two cobosses all held PhD s Materials Science and Engineering but had the task of analyzing the a1terial disease in legs Their specialty was all Materials Science and they barely knew anything about anatomy or the body All they knew was that the red veins pumped up while the blue veins pumped down but Dr Alan Pelton said one thing that really stood out to me Sometimes you don t work on exactly what you studied but you use your technical abilities that you developed to learn other things Eventually they were able to gure out the arteries situation this makes me hopeful for a lot of things in life What is a stent A stent is a metallic prostheses that holds open vessels It is used to treat arterial diseases by inseIting a wire metal tube used to prop open an artery during surgery It is collapsed to a small diameter and put over a balloon catheter It is moved into the area of the blockage so when the balloon is in ated it expands locks in place and forms a scaffold This keeps the artery open holds it open and improves the blood ow to the heart muscle Within just a few weeks of the introduction of the stent into the body the inside lining of the artery grows over the metal surface of the stent What was the rst stent design Who designed it When Dr Alan Pelton said that Dr Charles Dotter is the Father of stenting In 1964 he pioneered the invention of the catheterdelivered stent which was used to treat peripheral arterial diseases In January of 1964 Dotter purcutaneously with the use of a needle dilated a tight localized stenosis of the femoral artery in an 82 year old woman by the name of Laura Shaw She had painful leg ischemia when the leg does not receive the necessary amount of oxygen through blood circulation required for activity and gangrene death of tissue in part of the body and refused getting her leg amputated Dr Krippaehne general surgeon referred her to Dotter and found her condition an ideal lesion to test his dilating catheters After successful dilation with the stent circulation returned to her leg and her foot was warm and hyperemic Her pain disappeared within a week and the ulcer healed She died almost three years later from congestive heart failurepneumonia fully able to walk on her own two feet What are the primary design factors utilized in designing a stent The most important mechanical requirements for a stent are radial stiffness and fatigue life Although both can be evaluated through physical tests they require iterations and involve long lasting fatigue test This means they can be very costly and time consuming A ten year device fatigue life under a heart rate of 75 beats per minute means a 400 V39 million cycle loading on the stent With an accelerated fatigue tests it can still last for months In designing a stent it is preferable to have one with large side openings between the struts that can easy allow passage of a balloon or second stent into the side branch Slottedtube stents are suitable for stenting a bifurcation Closedcell design of the stent does not allow significant expansion of the opening toward the side branch even after the in ation ofa balloon The advantage of this decision is that the initial access to the side branch is facilitated Adjusting the parameters of the stent also has a major impact on how it will behave quotOpen designquot stents or stents where every other horizontal rod is taken out bend easily which makes them good to put in curvy coronary arteries How is the stent tested in the laboratory One way a stent is tested in the laboratory as the CalBay National Instruments do is by using linear displacement transducers LVDTs to determine the diameter of the stents as they are heated from a super cooled state to normal body temperature A computer collects the data and graphs expansion vs temperature in real time for each stent When the test bath reaches body temperature analysis is performed on the displacement curve to determine if the stents meet the desired specification A report is generated for each test The software can also control the temperature of the bath and the LVDTs sensors of the stent This allows up to 30 stents to be tested at one time Also some labs can monitor stent durability or stent graft durability They can execute pulsatile durability testing for vascular stents for bending fatigue tension compression fatigue torsion fatigue and radial fatigue In many labs they test the mechanical and fatigue behavior of the stents along with the corrosion and biocampatability They test in the environment of the disease state cardiac pressure musculoskeletal motions and tissue response This tells the operational stress and gives a durability assessment