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skin-to-core bond strength

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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005251
EISBN: 978-1-62708-187-0
... used to strengthen the cores, which are the most fragile part of a mold assembly. Bonded sand molds can be based on inorganic binders, such as clay or cement, or organic resin-based binders. Inorganic binders, which have long been used in the production of foundry molds and cores, include such...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006473
EISBN: 978-1-62708-190-0
... was used to assure product reliability, to promote safety by reducing failure rates, and as a means to increase profit ( Ref 1 ). Since the mid-20th century, NDT has become a critical quality-control tool, particularly given the development and application of fracture mechanics and the move to ensure...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003043
EISBN: 978-1-62708-200-6
... being used only as fastener components, such as a core bolt or stem of a blind-type fastener, where size is limited and very high strength is required to function. Many fastener head styles exist in industry today: 100° reduced shear, 100° shear, 100° tension, AN 509, low-profile protruding, 12-point...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006457
EISBN: 978-1-62708-190-0
... crack or separate from the adherends. Impact can cause crushed honeycomb core, resulting in loss of strength. The crushed core can resonate during service and slowly degrade the adhesive by fatigue until it debonds from the adherend or until cracks occur adjacent to the skin-to-core fillets. Fortunately...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
.... Additives are used to increase the strength of the wax and to compensate for its shrinkage on cooling. Preformed ceramic cores are placed in the pattern die before injection. Alternatively, soluble wax cores may be used instead of ceramic cores; these are dissolved out of the pattern using a weak acid...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003021
EISBN: 978-1-62708-200-6
... assembled areas and a high strength-to-weight ratio ( Ref 8 ). Solvent bonding is applicable only for joining of amorphous thermoplastics, whereas adhesive bonding can be used with almost all plastics. The weldability of plastics depends on whether they are thermosets or thermoplastics. In the case...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005242
EISBN: 978-1-62708-187-0
... disposal fees) also influence the choice of a bonding molding. Nonetheless, there are several reasons why other sand binders ( Table 1 ) are a useful alternative to green sand in rms of: Flexibility in production rate capability High strength for intricate molds and cores Tighter dimensional...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003047
EISBN: 978-1-62708-200-6
... high deformation rates or high peeling rates, analogous to lower temperature, the chains do not have time to move or disentangle, and the adhesive behaves more like a solid. The apparent strength of the bond is a function of the rate at which the bond is tested to destruction, for example, by peeling...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003046
EISBN: 978-1-62708-200-6
... reinserted to bond the core to the inner skin and make the foam-bond core splice. The core is then sanded flush with the inside surface of the outer face. The patch for the outer face, consisting of replacement plies against the scarf and a five-ply supplement outside the original mold line, is entirely co...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003064
EISBN: 978-1-62708-200-6
... preferred orientation of the graphene layers determines the modulus of the fiber, while both axial and radial textures, as well as flaws, affect fiber strength. The orientation of the graphene layers at the fiber surface affects wetting and the strength of the interfacial bond to the matrix. The following...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005354
EISBN: 978-1-62708-187-0
... first reaction is that of sodium silicate with CO 2 gas to form sodium carbonate and silica gel and water. At this stage, the system has reached 20 to 40% of its ultimate strength. The second mechanism is the dehydration of the silica to form a glasslike bond. If the gassed core or mold is allowed to...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005243
EISBN: 978-1-62708-187-0
... machines (to meet the demands for casting accuracy and integrity), the montmorillonite, or bentonite, clays are used primarily because of their increased durability when heated, higher bonding strength, and plasticity. Except for relatively few applications (such as thin-section castings), fireclay (kaolin...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005351
EISBN: 978-1-62708-187-0
... degraded, particularly in elongation/ductility and fatigue strength, which are most sensitive to the presence of inclusions. Inclusions also are harder than the surrounding matrix and give rise to tool chatter, tool wear, and ultimately, tool breakage during machining operations. In addition, inclusions...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005299
EISBN: 978-1-62708-187-0
... erosion. When required, other more complicated additions to gating systems are used, including whirl gates, horn gates, strainer cores, tangential gates, and slit gates. However, any addition to the gating system usually increases the cost of the casting because all gating must be removed. In...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003205
EISBN: 978-1-62708-199-3
... (usually a thermosetting or thermoplastic resin) is placed between the faying surfaces of the parts or bodies called adherends. The adhesive then solidifies or hardens by physical or chemical property changes to produce a bonded joint with useful strength between the adherends. More detailed information on...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003063
EISBN: 978-1-62708-200-6
... strength (bond strength) between the fiber and matrix It is generally believed that fiber pullout and crack deflection are the primary toughening mechanisms in CMCs. To optimize fiber pullout, it is desirable to have a poor bond between the fiber and the matrix. Control of coating thickness is...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003010
EISBN: 978-1-62708-200-6
... calcium carbonate, glass flakes, alumina trihydrate, and wood flour are added to reduce cost and increase the rigidity of the cured article, while fibers such as glass, carbon, and polyaramid increase strength and stiffness. Reinforcements typically account for 40 to 70 wt% of the total composition...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003091
EISBN: 978-1-62708-199-3
... of hot metal produced per unit volume of the furnace and the amount of fuel used. These improvements are the result of several advancements. Use of high-strength, super-fluxed sinters permitting the use of higher flame temperatures, coal washing, and blending to lower ash and sulfur; stamp...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005252
EISBN: 978-1-62708-187-0
... a problem, because it is driven off when the sand is heated to the minimum temperature of 120 °C (250 °F) before coating. Breakage of molds or cores during molding reflects low strength. This can be caused by the use of a finer sand screen distribution without a proportionate increase in resin...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009021
EISBN: 978-1-62708-187-0
... Abstract Thin sections save weight and thus contribute to a more favorable strength-to-weight ratio. By requiring a smaller volume of metal, thin walls may also lower casting costs, particularly when an expensive alloy is being poured. This article discusses the design problems in thin-wall...