ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt cast-iron cylinder, e = 100 gpa...

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ΚΟΧΛΙΕΣ ΣΥΣΦΙΓΞΗΣ (threaded fasteners) 1

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Page 1: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

ΚΟΧΛΙΕΣ ΣΥΣΦΙΓΞΗΣ (threaded fasteners)

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Page 2: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 3: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 4: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 5: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Further implications of the initial bolt tension for fatigue loading will be discussed in a nextSection.

Page 6: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Remember, this is only an approximate relationship,dependent on “average” conditions of thread friction.

Page 7: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 8: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 9: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 10: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 11: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 12: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 13: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 14: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 15: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 16: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 17: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 18: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 19: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 20: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Όταν ένας κοχλίας υπόκειται σε δυναμικήκαταπόνηση, πρέπει να υπολογίζεταιλαμβάνοντας υπ' όψη τον συντελεστήσυγκέντρωσης τάσεων.

Τα κρίσιμα σημεία για αστοχία είναι:(α) το σημείο αλλαγής της διαμέτρου κάτω απότην κεφαλή του κοχλία(β) το σημείο αρχής τουσπειρώματος(γ) κατά μήκος του σπειρώματος μέσα στοπερικόχλιο.Ο συντελεστής συγκ. τάσεων εξαρτάται απότο λόγο d/R (R ακτίνα καμπυλότητας στοσπείρωμα)

Διάγραμμα διαρκούς δυναμικής αντοχής σe για χαλύβδινους κοχλίες διαφόρων κατηγοριώνΤο σe εμπεριέχει το συντελεστή συγκέντρωσης τάσεων

Page 21: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 22: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 23: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 24: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 25: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 26: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 27: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 28: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 29: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 30: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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Page 31: ΚΟΧΛΙΕΣΣΥΣΦΙΓΞΗΣ (threaded fasteners) · steel bolt Cast-iron cylinder, E = 100 GPa Briefly, the rationale behind so high an initial tension is the following. 1. For

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