Conceptual Prototypes of Composite Structures for Aerospace

Shape memory composites (SMCs) are very interesting for self-deployable structures in aerospace applications. SMCs have been widely developed but not yet fully applied to space. In this study a lab-scale production of SMC prototypes for aerospace is described. Conceptual design of small-scale structures were prototyped with the aim to define several configurations which are able to self-deploy. SMC prototypes were manufactured by using two layers of carbon/epoxy prepreg with a shape memory epoxy resin interlayer. Two different configurations were produced to prototype complex shape for multiple folding and 3D deployments of de-orbiting structures. In particular, the first prototype tests a de-orbiting system without the sail to study the complex folding and de-folding mechanisms. The second configuration evaluates a de-orbiting dual-sail for satellite applications. The SMC structures were produced in the opened shape and subsequently memorized in the closed configuration. The initial deployed configuration is recovered by heating the prototype. The closed configuration increases the packing efficiency of large structures for space orbiting systems. The shape memory properties were provided only to folding zones. Memory-recovery-cycles have been performed to test SMC performances. As a result, the two configurations can successfully self-deploy following the desired design constraints and recovering the original flatness without noticeable defects.

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Shape Memory Composites for Self-deployable Structures in Aerospace Applications

Procedia Engineering ◽

10.1016/j.proeng.2014.11.124 ◽

2014 ◽

Vol 88 ◽

pp. 42-47 ◽

Cited By ~ 45

Author(s):

Loredana Santo ◽

Fabrizio Quadrini ◽

Antonio Accettura ◽

Walter Villadei

Keyword(s):

Shape Memory ◽

Deployable Structures ◽

Aerospace Applications ◽

Shape Memory Composites

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Shape Memory Composite Hands for Space Applications

Volume 1: Processing ◽

10.1115/msec2015-9289 ◽

2015 ◽

Cited By ~ 3

Author(s):

Fabrizio Quadrini ◽

Giovanni Matteo Tedde ◽

Loredana Santo

Keyword(s):

Shape Memory ◽

Composite Structures ◽

Polymer Matrix Composites ◽

Fiber Composite ◽

Shape Memory Polymer ◽

Small Scale ◽

Carbon Fiber Composite ◽

Space Applications ◽

First Case ◽

Shape Memory Composite

Shape memory composites combine structural properties of continuous-fiber polymer-matrix composites with functional behavior of shape memory polymers. In this study, the production of shape memory composite structures for aerospace applications is described. Small-scale grabbing systems were prototyped as they could be used for space cleaning operations. Composite hands were manufactured by using two carbon fiber composite layers with a shape memory polymer interlayer. They were produced in the closed-hand configuration and subsequently opened in the memorizing step. Due to heating, composites tended to recover the initial closed configuration, allowing to grab small objects. Two different shapes (cylindrical and cubic) were considered for composite hands. In the first case, the shape memory behavior was given to the entire structure whereas, in the second case, shape memory properties were provided only to folding zones. As a result, a good shape recovery was observed in both cases but part weight was already not negligible also in these small-scale systems.

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Joule-Heating Activated Flexible Composite Structures Using Shape Memory Epoxy

Volume 1: Advances in Aerospace Technology ◽

10.1115/imece2017-72141 ◽

2017 ◽

Author(s):

Jingyu Wang ◽

David Lee ◽

Yingtao Liu

Keyword(s):

Carbon Fiber ◽

Shape Memory ◽

Joule Heating ◽

Composite Structures ◽

Memory Function ◽

Electrical Current ◽

Fiber Reinforced ◽

Flexible Composites ◽

Aerospace Applications ◽

Carbon Fiber Reinforced

In this paper, a novel shape memory epoxy based composites is employed to design and develop new flexible composites for aerospace applications. The epoxy and carbon fiber reinforced epoxy were first synthesized and characterized to understand their shape memory property. The characterized epoxy is used as the polymer matrix in carbon fiber reinforced composites. The shape memory function of the fabricated composites is experimental characterized using the Joule-heating based method. The Joule-heating based activation method using direct electrical current is systematically characterized to understand the shape recovery speed at different temperature. It was observed that the developed composites have good flexibility and response to Joule heat quickly during deployment. Such composite materials can be further used to design and develop flexible composites and aerospace structures, such as satellite panel trusses and solar sail boom structures.

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AGRICULTURAL PRODUCTION OF CA DONG PEOPLE IN RESETTLEMENT AREA OF TRANH RIVER HYDROPOWER NUMBER 2: CURRENT SITUATION AND IMPACT FACTORS

Tạp chí Nghiên cứu dân tộc ◽

10.25073/0866-773x/428 ◽

2020 ◽

Vol 9 (2) ◽

Author(s):

Bùi Thị Bích Lan

Keyword(s):

Social Relations ◽

Agricultural Production ◽

Large Scale ◽

Transition Process ◽

Impact Factors ◽

Small Scale ◽

Scale Production ◽

Technical Application ◽

Production Models ◽

Role Of The State

In Vietnam, the construction of hydropower projects has contributed significantly in the cause of industrialization and modernization of the country. The place where hydropower projects are built is mostly inhabited by ethnic minorities - communities that rely primarily on land, a very important source of livelihood security. In the context of the lack of common productive land in resettlement areas, the orientation for agricultural production is to promote indigenous knowledge combined with increasing scientific and technical application; shifting from small-scale production practices to large-scale commodity production. However, the research results of this article show that many obstacles in the transition process are being posed such as limitations on natural resources, traditional production thinking or the suitability and effectiveness of scientific - technical application models. When agricultural production does not ensure food security, a number of implications for people’s lives are increasingly evident, such as poverty, preserving cultural identity, social relations and resource protection. Since then, it has set the role of the State in researching and building appropriate agricultural production models to exploit local strengths and ensure sustainability.

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Study of Diabetic Mellitus and Knowledge of Lotion Foot Care on the Community

International Journal of Pharmaceutical Quality Assurance ◽

10.25258/ijpqa.v9i3.13659 ◽

2018 ◽

Vol 9 (3) ◽

Author(s):

Hariyadi DM ◽

Athiyah U ◽

Hendradi E ◽

Rosita N ◽

Erawati T ◽

...

Keyword(s):

Blood Glucose ◽

T Test ◽

Small Scale ◽

Scale Production ◽

Foot Care ◽

Diabetic Mellitus ◽

Glucose Levels ◽

Blood Glucose Levels ◽

Before And After ◽

History Of

The prevention of Diabetic Mellitus (DM) and its complications is the main aim of this study, in addition to the training of lotion foot care application and the development of small scale industry. The research team delivered knowledge in the form of training on Diabetic Mellitus, healthy food, treatment and prevention of complications, and small-scale production of cosmetic products. The aim of this study was to determine the correlation between training on diabetic and lotion foot care application as preventive measures against diabetic complications on the patient's blood glucose levels in the community of residents in Banyuurip Jaya, Surabaya. It was expected from this training that the knowledge of the residents increases and people living with diabetic undergo lifestyle changes and therefore blood sugar levels can be controlled. The parameters measured in this research were blood glucose levels, the anti diabetic drug types consumed, and compliance on diabetics. This study used the data taken from 60 patients with DM over a period of one month. Questionnaires and log books was used to retrieve data and changes in blood glucose levels in diabetic patients. The results showed the demographic data of patients with type 2 diabetic of 85% female and 15% male, with the range of patients aged of 61-70 years of 46.67% and had history of diabetic (90%). The history of drugs consumed by respondents was anti diabetic drugs such as metformin (40%), glimepiride (33.37%) and insulin (6.67%). In addition, the increased knowledge of DM patients after being given the training compared to before training was shown in several questions in the questionnaire. A statistical analysis using t-test analyzed a correlation between training provided in order to enhance understanding of the patient, as well as correlation with blood glucose levels. A paired T-test showed that there was a relationship between the knowledge of trainees before and after training (p less than 0.05). An interesting result was that there was no relationship between blood glucose levels before and after training provided (p> 0.05).

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Ritual Economy and the Organization of Scioto Hopewell Craft Production: Insights from the Outskirts of the Mound City Group

American Antiquity ◽

10.1017/aaq.2019.105 ◽

2020 ◽

Vol 85 (2) ◽

pp. 279-304

Author(s):

Timothy D. Everhart ◽

Bret J. Ruby

Keyword(s):

Craft Production ◽

Small Scale ◽

Magnetic Survey ◽

Middle Woodland ◽

The North ◽

Large Structures ◽

Production Site ◽

Production And Consumption ◽

Ritual Economy ◽

City Group

This article offers insights into the organization of Scioto Hopewell craft production and examines the implications of this organization through the lens of ritual economy. We present a novel analysis of investigations at the North 40 site, concluding that it is a craft production site located on the outskirts of the renowned Mound City Group. High-resolution landscape-scale magnetic survey revealed a cluster of three large structures and two rows of associated pits; one of the buildings and three of the pits were sampled in excavations. Evidence from the North 40 site marks this as the best-documented Scioto Hopewell craft production site. Mica, chert, and copper were crafted here in contexts organized outside the realm of domestic household production and consumption. Other material remains from the site suggest that crafting was specialized and embedded in ceremonial contexts. This analysis of the complex organization of Scioto Hopewell craft production provides grounds for further understanding the elaborate ceremonialism practiced by Middle Woodland (AD 1–400) societies and adds to the known complexity of craft production in small-scale societies. Furthermore, this article contributes to a growing body of literature demonstrating the utility of ritual economy as a framework for approaching the sociality of small-scale societies.

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