Pub Date : 2024-01-01DOI: 10.21608/erjsh.2023.206409.1161
H. Eltobgy, Fathy Abdelfattah, Emad Darwish, Hisham Ali
{"title":"Experimental Investigation on the Capacity of Steel Cold Formed RHS Tubular Stub Columns with A Central Circular Web Opening","authors":"H. Eltobgy, Fathy Abdelfattah, Emad Darwish, Hisham Ali","doi":"10.21608/erjsh.2023.206409.1161","DOIUrl":"https://doi.org/10.21608/erjsh.2023.206409.1161","url":null,"abstract":"","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"10 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139637729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: This study presents a new modification for the cooling circuit design of the Molten Salt Fast Reactor MSFR to solve the problem of high temperatures in the hot spots regions that affect the reactor safety. These high temperature regions appear as a result of the salt recirculation of the liquid fuel. This problem causes a decrease in the delayed neutron fraction value β eff. . This decrease in β eff. reduces the safety of the reactor because it shifts it more close to the prompt critical state. The new modification depends on distributing the flow between the side and the centre by adding a coolant circuit passes through the core centre from the bottom to the top. At the end of this study we see that this new design moderated the hot spots and reduced the maximum temperature to about 1120 k. This value is greater than the core outlet temperature by about 77 k and smaller than the maximum temperature of the benchmark design by about 160 k. The design also reduced the salt velocity from the benchmark value 3.9 m/s to the value 2.38 m/s.
{"title":"Safety Enhancement in the Molten Salt Fast Reactor (MSFR)","authors":"Montaser Mohamed, Ramadan Moustafa, Nader Mohamed, Abdelfattah Soliman, Mamdouh Aldosouky","doi":"10.21608/erjsh.2023.198333.1153","DOIUrl":"https://doi.org/10.21608/erjsh.2023.198333.1153","url":null,"abstract":": This study presents a new modification for the cooling circuit design of the Molten Salt Fast Reactor MSFR to solve the problem of high temperatures in the hot spots regions that affect the reactor safety. These high temperature regions appear as a result of the salt recirculation of the liquid fuel. This problem causes a decrease in the delayed neutron fraction value β eff. . This decrease in β eff. reduces the safety of the reactor because it shifts it more close to the prompt critical state. The new modification depends on distributing the flow between the side and the centre by adding a coolant circuit passes through the core centre from the bottom to the top. At the end of this study we see that this new design moderated the hot spots and reduced the maximum temperature to about 1120 k. This value is greater than the core outlet temperature by about 77 k and smaller than the maximum temperature of the benchmark design by about 160 k. The design also reduced the salt velocity from the benchmark value 3.9 m/s to the value 2.38 m/s.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.214633.1180
Mina Hanna, Sameh Habib, Khalid Abd Elghany, Tamer Mahmoud
: 3D printing products have poor mechanical properties and thus less reliability for longer. Fused deposition modelling (FDM) is commonly used additive manufacturing technology. Mechanical and physical characteristics could be enhanced by checking out several FDM parameters as well as using brand new substances over this technology. This study analyzed the impact and compression strengths of Poly Lactic Acid/Carbon Fiber composites (CF/PLA). The research considered important methodological aspects: the effects of layer patterns (triangular and rectilinear), wall thickness and infilled density on compression and impact mechanical properties of 3D-printed PLA carbon-fibre samples, using an FDM 3D printing machine. The results showed that triangle samples have more mechanical stability and do not collapse suddenly, compared to rectilinear samples. This collapse was observed in the rectilinear samples with 1.2 mm of outer wall thickness and 70% or 85% of infill percentages, while the rectilinear samples showed the highest mechanical performance. The infill density is the most important parameter for all rectilinear samples, as the lowest impact strength of 0.20 kJ/m2 was recorded for a sample with 70% infill and 6 mm wall thickness.
:三维打印产品的机械性能较差，因此在较长时间内可靠性较低。熔融沉积建模（FDM）是常用的增材制造技术。通过检查 FDM 的几个参数以及在该技术上使用全新物质，可以提高机械和物理特性。本研究分析了聚乳酸/碳纤维复合材料（CF/PLA）的冲击强度和压缩强度。研究考虑了重要的方法论问题：层模式（三角形和直线形）、壁厚和填充密度对使用 FDM 3D 打印机 3D 打印聚乳酸碳纤维样品的压缩和冲击机械性能的影响。结果表明，与直线型样品相比，三角形样品具有更高的机械稳定性，不会突然塌陷。在外壁厚度为 1.2 毫米、填充率为 70% 或 85% 的直线型样品中观察到了这种塌陷，而直线型样品则显示出最高的机械性能。填充密度是所有直线型样品最重要的参数，因为填充密度为 70%、壁厚为 6 毫米的样品的冲击强度最低，仅为 0.20 kJ/m2。
{"title":"The effect of printing parameters on crushing behavior of 3D printed Poly Lactic Acid/Carbon Fiber samples using Material Extrusion technique","authors":"Mina Hanna, Sameh Habib, Khalid Abd Elghany, Tamer Mahmoud","doi":"10.21608/erjsh.2023.214633.1180","DOIUrl":"https://doi.org/10.21608/erjsh.2023.214633.1180","url":null,"abstract":": 3D printing products have poor mechanical properties and thus less reliability for longer. Fused deposition modelling (FDM) is commonly used additive manufacturing technology. Mechanical and physical characteristics could be enhanced by checking out several FDM parameters as well as using brand new substances over this technology. This study analyzed the impact and compression strengths of Poly Lactic Acid/Carbon Fiber composites (CF/PLA). The research considered important methodological aspects: the effects of layer patterns (triangular and rectilinear), wall thickness and infilled density on compression and impact mechanical properties of 3D-printed PLA carbon-fibre samples, using an FDM 3D printing machine. The results showed that triangle samples have more mechanical stability and do not collapse suddenly, compared to rectilinear samples. This collapse was observed in the rectilinear samples with 1.2 mm of outer wall thickness and 70% or 85% of infill percentages, while the rectilinear samples showed the highest mechanical performance. The infill density is the most important parameter for all rectilinear samples, as the lowest impact strength of 0.20 kJ/m2 was recorded for a sample with 70% infill and 6 mm wall thickness.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.210117.1167
A. Hassanain, Mohamed Mohamed, Rehab El-hefny
: Phenol is a high-risk environmental pollutant even at small concentrations. This study was conducted to remove phenol from industrial wastewater by adsorption using sawdust and activated carbon manufactured from coconut and comparing phenol removal efficiency using 2 types of adsorbents. The phenol removal efficiency of each of the two different types of adsorbents was studied at different factors in terms of the initial concentrations of phenol in wastewater (200, 240 and 290) mg/l at contact times (30, 60, 90 and 120) minutes and pH (3.9, 3.5 and 2.4) with different doses of activated carbon (0.5, 0.9 and 1.2) g and other doses of sawdust (20, 30 and 40) g. The results showed an increase in removal efficiency while increasing the dose of the adsorbent and increasing contact time. The highest efficiency using activated carbon is 85.6% when using 0.9 g of activated carbon at contact time of 120 minutes, while the removal efficiency is 40.4% if using 40 g of sawdust at the time of contact of 120 minutes
{"title":"Removal of Phenolic Compounds from Industrial Wastewater Through Adsorption Techniques","authors":"A. Hassanain, Mohamed Mohamed, Rehab El-hefny","doi":"10.21608/erjsh.2023.210117.1167","DOIUrl":"https://doi.org/10.21608/erjsh.2023.210117.1167","url":null,"abstract":": Phenol is a high-risk environmental pollutant even at small concentrations. This study was conducted to remove phenol from industrial wastewater by adsorption using sawdust and activated carbon manufactured from coconut and comparing phenol removal efficiency using 2 types of adsorbents. The phenol removal efficiency of each of the two different types of adsorbents was studied at different factors in terms of the initial concentrations of phenol in wastewater (200, 240 and 290) mg/l at contact times (30, 60, 90 and 120) minutes and pH (3.9, 3.5 and 2.4) with different doses of activated carbon (0.5, 0.9 and 1.2) g and other doses of sawdust (20, 30 and 40) g. The results showed an increase in removal efficiency while increasing the dose of the adsorbent and increasing contact time. The highest efficiency using activated carbon is 85.6% when using 0.9 g of activated carbon at contact time of 120 minutes, while the removal efficiency is 40.4% if using 40 g of sawdust at the time of contact of 120 minutes","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139327338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.223693.1193
Sherif Ahmed
: Education is a fundamental right of every human being and should be available to all children, regardless of their socioeconomic background or geographical location. The provision of school buildings in slums or unplanned urban areas presents many challenges. These include overpopulation and smaller plots of land remaining for services. However, it is necessary to understand the needs of marginalized groups, and to provide them with a minimum level of community services, especially educational services which are the most important element of community development. The study highlights the difficulties facing the provision of school buildings in these areas, especially with the small size and scarcity of land, it explores the features of compact design as a flexible and effective tool in adapting school buildings to small plots of land and enables the architectural designer to provide spaces such as schoolyards and playgrounds. The study presents a design model for a compact educational building, then actual site models are developed from the study area, and the results of the hypothetical application are analyzed to determine the effectiveness of the results and to find the appropriate recommendations. This contributes to finding suitable alternatives to provide educational buildings in those areas in a manner appropriate to the current conditions while developing flexible requirements in determining the suitability of the site for building schools, to make the most of small plots of land in the future.
{"title":"COMPACT DESIGN CONCEPT AS AN ALTERNATIVE FOR ADAPTING SCHOOL BUILDINGS TO SMALL PLOTS IN SLUMS AND UNPLANNED URBAN AREAS","authors":"Sherif Ahmed","doi":"10.21608/erjsh.2023.223693.1193","DOIUrl":"https://doi.org/10.21608/erjsh.2023.223693.1193","url":null,"abstract":": Education is a fundamental right of every human being and should be available to all children, regardless of their socioeconomic background or geographical location. The provision of school buildings in slums or unplanned urban areas presents many challenges. These include overpopulation and smaller plots of land remaining for services. However, it is necessary to understand the needs of marginalized groups, and to provide them with a minimum level of community services, especially educational services which are the most important element of community development. The study highlights the difficulties facing the provision of school buildings in these areas, especially with the small size and scarcity of land, it explores the features of compact design as a flexible and effective tool in adapting school buildings to small plots of land and enables the architectural designer to provide spaces such as schoolyards and playgrounds. The study presents a design model for a compact educational building, then actual site models are developed from the study area, and the results of the hypothetical application are analyzed to determine the effectiveness of the results and to find the appropriate recommendations. This contributes to finding suitable alternatives to provide educational buildings in those areas in a manner appropriate to the current conditions while developing flexible requirements in determining the suitability of the site for building schools, to make the most of small plots of land in the future.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139328413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.213115.1175
shahenaz Abdelraouf, Osama Abdellatif, Mohamed A. Moawed, Mohamed Ibrahim
: Forests play a vital role in nature, purifying water, sustaining the land, cycling nutrients, regulating climate, and storing carbon. They also provide habitat for many species and contribute to economic wealth. This study involves an extensive survey of firefighters regarding the current issues facing their field of work and potential technology solutions. It also assesses the efforts made by the academy and businesses to use a variety of robot types for firefighting operations. The recommended technique consists of a few octa-copters that can not only visit waypoints and transport shipments on their own but can also carry out duties like monitoring, mapping, and observation. The three established operator positions task commanding officer, team leaders, and team members each have a unique information access role and mission-related duties. These operators make use of interfaces for virtual and augmented reality to easily gather scenario data and, in the instance of the mission chief, direct the drone swarm.
{"title":"Enhancing Efficiency and Safety in Forest Firefighting: A Comprehensive Review of Drone Applications","authors":"shahenaz Abdelraouf, Osama Abdellatif, Mohamed A. Moawed, Mohamed Ibrahim","doi":"10.21608/erjsh.2023.213115.1175","DOIUrl":"https://doi.org/10.21608/erjsh.2023.213115.1175","url":null,"abstract":": Forests play a vital role in nature, purifying water, sustaining the land, cycling nutrients, regulating climate, and storing carbon. They also provide habitat for many species and contribute to economic wealth. This study involves an extensive survey of firefighters regarding the current issues facing their field of work and potential technology solutions. It also assesses the efforts made by the academy and businesses to use a variety of robot types for firefighting operations. The recommended technique consists of a few octa-copters that can not only visit waypoints and transport shipments on their own but can also carry out duties like monitoring, mapping, and observation. The three established operator positions task commanding officer, team leaders, and team members each have a unique information access role and mission-related duties. These operators make use of interfaces for virtual and augmented reality to easily gather scenario data and, in the instance of the mission chief, direct the drone swarm.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139328857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.214922.1181
Aya Mohamed mahmoud, Ahmed Eldesouky Faggal, Ashraf Nessim
: Improving efficiency in emergency departments can be achieved through Evidence-Based Design (EBD), which uses data and research to inform facility design and improve patient outcomes. By designing patient rooms that facilitate healing and recovery, or layouts that limit the risk of infection transmission, EBD can help reduce medical errors, infections, and falls in healthcare facilities. One effective way to improve healthcare facilities is through post-occupancy evaluations. These evaluations identify areas for improvement and create more efficient systems that reduce costs, improve patient satisfaction, and enhance the quality of care. By applying evidence-based design principles and evaluations, emergency department operations can become more effective and efficient. The problem with the research is that design criteria are important for hospital efficiency, but emergency departments are sometimes overlooked. Architects must balance patient needs with client satisfaction and cost minimization, which can lead to ED overcrowding due to financing strategies and increasing demand. The research methodology adopted a theoretical review of literature and codes, an analytical study of EBD strategies and tools, and a future quantitative assessment through an applied study and staff interviews.
{"title":"Literature Review of Post-Occupancy Evaluation in Emergency Departments in Hospitals","authors":"Aya Mohamed mahmoud, Ahmed Eldesouky Faggal, Ashraf Nessim","doi":"10.21608/erjsh.2023.214922.1181","DOIUrl":"https://doi.org/10.21608/erjsh.2023.214922.1181","url":null,"abstract":": Improving efficiency in emergency departments can be achieved through Evidence-Based Design (EBD), which uses data and research to inform facility design and improve patient outcomes. By designing patient rooms that facilitate healing and recovery, or layouts that limit the risk of infection transmission, EBD can help reduce medical errors, infections, and falls in healthcare facilities. One effective way to improve healthcare facilities is through post-occupancy evaluations. These evaluations identify areas for improvement and create more efficient systems that reduce costs, improve patient satisfaction, and enhance the quality of care. By applying evidence-based design principles and evaluations, emergency department operations can become more effective and efficient. The problem with the research is that design criteria are important for hospital efficiency, but emergency departments are sometimes overlooked. Architects must balance patient needs with client satisfaction and cost minimization, which can lead to ED overcrowding due to financing strategies and increasing demand. The research methodology adopted a theoretical review of literature and codes, an analytical study of EBD strategies and tools, and a future quantitative assessment through an applied study and staff interviews.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.208674.1165
Eissa Ali, S. Mohamed, karim eldash
: The increased cost of applying health, safety, and environmental standards to sustainable projects, as compared to traditional projects, causes project owners and contractors considerable concern because it reduces profits. The objective of the study is to identify the most significant factors that contribute to the increasing cost of sustainable projects. The study assesses the factors that increase the cost of implementing health, safety, and environmental management standards in sustainable construction projects as compared to traditional projects. Toward this end, a field survey was conducted on a sample of 53 selected projects in a specific geographical area with a high intensity of construction work. Data was collected using structured questionnaires and analyzed using a tabulated presentation that determined the percentages of responses given. The study's findings indicate that selecting HSE managers with more experience, increasing scaffolding security and specialized training and using more personal protection equipment in sustainable projects are some of the most significant variables causing cost increases. The findings show that improved HSE regulations are needed for the Egyptian construction sector, especially in traditional projects. To attain cost effectiveness, HSE issues must be recognized and integrated early in the project cycle. On sustainable Egyptian projects, the client, consultant, and contractor must collaborate to enhance health, safety, and the environment.
{"title":"IDENTIFYING THE FACTORS THAT INCREASE THE COST OF HSE IN SUSTAINABLE PROJECTS COMPARED TO TRADITIONAL PROJECTS IN EGYPT","authors":"Eissa Ali, S. Mohamed, karim eldash","doi":"10.21608/erjsh.2023.208674.1165","DOIUrl":"https://doi.org/10.21608/erjsh.2023.208674.1165","url":null,"abstract":": The increased cost of applying health, safety, and environmental standards to sustainable projects, as compared to traditional projects, causes project owners and contractors considerable concern because it reduces profits. The objective of the study is to identify the most significant factors that contribute to the increasing cost of sustainable projects. The study assesses the factors that increase the cost of implementing health, safety, and environmental management standards in sustainable construction projects as compared to traditional projects. Toward this end, a field survey was conducted on a sample of 53 selected projects in a specific geographical area with a high intensity of construction work. Data was collected using structured questionnaires and analyzed using a tabulated presentation that determined the percentages of responses given. The study's findings indicate that selecting HSE managers with more experience, increasing scaffolding security and specialized training and using more personal protection equipment in sustainable projects are some of the most significant variables causing cost increases. The findings show that improved HSE regulations are needed for the Egyptian construction sector, especially in traditional projects. To attain cost effectiveness, HSE issues must be recognized and integrated early in the project cycle. On sustainable Egyptian projects, the client, consultant, and contractor must collaborate to enhance health, safety, and the environment.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.214411.1179
Mina Hanna, Sameh Habib, Khalid Abd Elghany, Tamer Mahmoud
: Engineering product designs are becoming more complicated in shape and need sustainability for longer lifetimes; there is a need for new technology like 3D printing for fabricating complex parts. Fused deposition modelling (FDM) is among the widely used additive manufacturing technology to fabricate quality products with effective expenses. This investigation considered significant methodological parameters: layer layouts/ patterns (triangular and rectilinear), wall thickness (1.2,3.6,6) and infilled density (70, 85 and 100%) analyzed to check out right into their results on compression and impact mechanical behaviors of 3D-printed Poly Lactic Acid pulse (PLA+), utilizing FDM 3D printing machine. The Central Composite Face-centered (CCF)technique was conducted to design an optimal number of experiments. The compression and impact tests were applied according to ASTM guidelines. The results showed that the Rectilinear samples were mechanically weaker than the Triangle samples, as the samples with 1.2 mm outer wall and 70% or 85% infill collapsed abruptly. The outer wall thickness was the most effective parameter for all samples, as the triangle sample with 6 mm walls and 85% infill had the
:工程产品设计的形状越来越复杂，而且需要可持续发展以延长使用寿命；因此需要新技术（如三维打印技术）来制造复杂部件。熔融沉积建模（FDM）是广泛使用的增材制造技术之一，能以有效的成本制造出高质量的产品。本研究考虑了重要的方法参数：层布局/模式（三角形和直线形）、壁厚（1.2、3.6、6）和填充密度（70、85 和 100%），利用 FDM 3D 打印机分析了它们对 3D 打印聚乳酸脉冲（PLA+）的压缩和冲击机械行为的影响。采用中心复合面中心（CCF）技术设计了最佳实验次数。根据 ASTM 准则进行了压缩和冲击试验。结果表明，直线型样品的机械强度低于三角形样品，因为外壁厚度为 1.2 毫米、填充率为 70% 或 85% 的样品会突然坍塌。外壁厚度是所有样品中最有效的参数，因为外壁厚度为 6 毫米、填充率为 85% 的三角形样品的力学性能最好。
{"title":"Study the crushing behavior of 3D printed Poly Lactic Acid samples","authors":"Mina Hanna, Sameh Habib, Khalid Abd Elghany, Tamer Mahmoud","doi":"10.21608/erjsh.2023.214411.1179","DOIUrl":"https://doi.org/10.21608/erjsh.2023.214411.1179","url":null,"abstract":": Engineering product designs are becoming more complicated in shape and need sustainability for longer lifetimes; there is a need for new technology like 3D printing for fabricating complex parts. Fused deposition modelling (FDM) is among the widely used additive manufacturing technology to fabricate quality products with effective expenses. This investigation considered significant methodological parameters: layer layouts/ patterns (triangular and rectilinear), wall thickness (1.2,3.6,6) and infilled density (70, 85 and 100%) analyzed to check out right into their results on compression and impact mechanical behaviors of 3D-printed Poly Lactic Acid pulse (PLA+), utilizing FDM 3D printing machine. The Central Composite Face-centered (CCF)technique was conducted to design an optimal number of experiments. The compression and impact tests were applied according to ASTM guidelines. The results showed that the Rectilinear samples were mechanically weaker than the Triangle samples, as the samples with 1.2 mm outer wall and 70% or 85% infill collapsed abruptly. The outer wall thickness was the most effective parameter for all samples, as the triangle sample with 6 mm walls and 85% infill had the","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.218062.1184
randa soliman, Tarek El Heinawy, Ahmed Abdelrasoul
{"title":"Monitoring the development of traditional architecture vocabulary responsible for natural ventilation to achieve thermal comfort in contemporary architecture","authors":"randa soliman, Tarek El Heinawy, Ahmed Abdelrasoul","doi":"10.21608/erjsh.2023.218062.1184","DOIUrl":"https://doi.org/10.21608/erjsh.2023.218062.1184","url":null,"abstract":"","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139327284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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